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"Remove unused JavaScript", "pageCount": 100, "totalEstimatedSavingsBytes": 13506657, "totalEstimatedBlockingMs": 0 }, { "id": "unused-css-rules", "title": "Remove unused CSS", "pageCount": 100, "totalEstimatedSavingsBytes": 9519046, "totalEstimatedBlockingMs": 0 }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "pageCount": 100, "totalEstimatedSavingsBytes": 0, "totalEstimatedBlockingMs": 150288 }, { "id": "uses-responsive-images", "title": "Right-size images for viewport", "pageCount": 32, "totalEstimatedSavingsBytes": 6360935, "totalEstimatedBlockingMs": 0 }, { "id": "uses-text-compression", "title": "Enable text compression", "pageCount": 15, "totalEstimatedSavingsBytes": 459096, "totalEstimatedBlockingMs": 0 }, { "id": "unminified-javascript", "title": "Minify JavaScript", "pageCount": 8, "totalEstimatedSavingsBytes": 373352, "totalEstimatedBlockingMs": 0 }, { "id": "unminified-css", "title": "Minify CSS", "pageCount": 4, "totalEstimatedSavingsBytes": 14671, "totalEstimatedBlockingMs": 0 } ] }, "offlineSupportSummary": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "assessedPages": 100, "averageScore": 100, "highUrgencyPages": 100, "pagesWithoutServiceWorker": 100, "pagesWithoutOfflineSupport": 100, "pagesWithWeakCacheTtl": 100, "recurringOpportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "pageCount": 100 }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "pageCount": 100 }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "pageCount": 100 }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "pageCount": 100 }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "pageCount": 100 } ] }, "languageVersionSummary": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "assessedPages": 100, "averageScore": 0, "highUrgencyPages": 0, "pagesWithOutdatedRuntimeSignals": 0, "pagesWithVersionDisclosure": 0, "topOutdatedSignals": [] }, "mediaHintsSummary": { "wsgReference": { "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use" }, "assessedPages": 100, "averageScore": 35.95, "highUrgencyPages": 0, "pagesWithAutoplay": 0, "pagesWithUnmutedAutoplay": 0, "pagesWithoutDarkMode": 100, "pagesWithLazyLoadingGap": 72 }, "wsgHighlightsSummary": { "assessedPages": 100, "averageScore": 85, "highlights": [ { "guideline": "11.3", "title": "Incomplete media lazy loading", "urgency": "medium", "detail": "Only 29/56 images use loading=\"lazy\". Global lazy loading reduces initial data transfer and energy consumption.", "wsid": "11.lazy loading", "assessor": "script", "example": "\"Description\"\n\n", "pageCount": 100, "pages": {}, "criteria": { "title": "Lazy loading", "description": "Incorporate lazy/deferred loading from the start: Consider which media elements are immediately required, and which would be better relegated to loading on specific user interaction. Load data-intensive media on the client side, including the media itself, behind a facade - a non-functional and static representational element.", "resources": [ { "Avoid hotlinking images with Cross-Origin-Resource-Policy": "https://www.sjoerdlangkemper.nl/2024/11/27/avoid-hotlinking-images-with-corp-cross-origin-resource-policy/", "Fast load times: Optimize Your Images": "https://web.dev/explore/fast?hl=en#optimize-your-images", "GPF - General Policy Framework (PDF) - 4.1 - UX and UI (Autoplay)": "https://www.arcep.fr/uploads/tx_gspublication/general_policy_framework_for_the_ecodesign_of_digital_services_version_2024.pdf", "GR491 - 9-5071 - Autoplay": "https://gr491.isit-europe.org/en/crit.php?id=9-5071-frontend-active-content-uses-technical-resources-to-function.", "GR491 - 9-5068 - Lazy Loading": "https://gr491.isit-europe.org/en/crit.php?id=9-5068-frontend-when-loading-the-service-on-the-user", "GreenIT - 0051 - Use lazy loading": "https://rweb.greenit.fr/en/fiches/RWEB_0051-use-lazy-loading", "How to Defer Offscreen Images and Background Images": "https://www.debugbear.com/blog/defer-offscreen-images", "Lazy Load Background Images with the IntersectionObserver API": "https://www.debugbear.com/blog/lazy-load-background-images-intersection-observer", "Lazy load third-party resources with facades": "https://developer.chrome.com/docs/lighthouse/performance/third-party-facades?hl=en", "Lazy loading (Wikipedia)": "https://en.wikipedia.org/wiki/Lazy_loading", "Lazy loading (Performance)": "https://developer.mozilla.org/en-US/docs/Web/Performance/Guides/Lazy_loading", "Lazy Loading Images Based on Screen Size": "https://www.aaron-gustafson.com/notebook/lazy-loading-images-based-on-screen-size/", "Non-blocking cross-browser image rendering on the canvas": "https://calendar.perfplanet.com/2025/non-blocking-image-canvas/", "Web Almanac: Sustainability": "https://almanac.httparchive.org/en/2024/sustainability" } ], "guideline": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "benefits": [ { "Economic": "Eliminating data-intensive media entirely and using alternatives such as transcripts reduce costs associated with hosting and data transfer.", "Environment": "Reducing the battery drain associated with loading data-intensive content by preventing auto-loading or delaying it until the moment it is required reduces energy emissions associated with data transfer and renering.", "Performance": "Tailoring user experience to the device, situation, and environment of the user by having different resolutions and quality formats available reduces wasted bandwidth. This can boost performance for users who make choices to reduce the data downloaded.", "Social Equity": "Providing alternatives to data-intensive media allows with limited bandwidth or older devices to access content." } ], "example": " \n \n \n \"\"\n" } }, { "guideline": "2.4", "title": "Review User Journey Efficiency", "urgency": "investigate", "detail": "Have a human walk through the main user journeys and verify they require the fewest steps possible. Unnecessary steps waste user time and device energy. Look for redundant confirmations, forced account creation, and non-essential interstitials.", "wsid": "2.minimize non-essential content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#minimize-non-essential-content-interactivity-or-journeys", "assessor": "human", "pageCount": 100, "pages": {}, "criteria": null }, { "guideline": "2.6", "title": "Check for Engagement Traps", "urgency": "investigate", "detail": "Manually review the page for patterns that artificially prolong engagement: infinite scroll, autoplay carousels, sticky overlays, and notification permission prompts. These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human", "pageCount": 100, "pages": {}, "criteria": null }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human", "pageCount": 100, "pages": {}, "criteria": null }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human", "pageCount": 100, "pages": {}, "criteria": null }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human", "pageCount": 100, "pages": {}, "criteria": null }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai", "pageCount": 100, "pages": {}, "criteria": null }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human", "pageCount": 100, "pages": {}, "criteria": null }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human", "pageCount": 100, "pages": {}, "criteria": null }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human", "pageCount": 100, "pages": {}, "criteria": null }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human", "pageCount": 100, "pages": {}, "criteria": null } ] }, "siteGuidance": { "siteCount": 1, "singleSiteScan": true, "sites": [ { "origin": "https://www.barcelona.cat", "pageCount": 100, "sharedRecommendations": [ { "area": "expected-files", "urgency": "low", "title": "Publish .well-known/security.txt", "detail": ".well-known/security.txt is missing for all sampled pages on https://www.barcelona.cat." }, { "area": "security-headers", "urgency": "high", "title": "Apply Content-Security-Policy site-wide", "detail": "CSP is absent across all sampled pages on https://www.barcelona.cat." }, { "area": "security-headers", "urgency": "medium", "title": "Enable Strict-Transport-Security site-wide", "detail": "HSTS is missing across all sampled HTTPS pages on https://www.barcelona.cat." }, { "area": "offline-support", "urgency": "high", "title": "Introduce service worker support", "detail": "No sampled pages on https://www.barcelona.cat indicate service worker support for offline resilience." }, { "area": "offline-support", "urgency": "high", "title": "Support offline fallback behavior", "detail": "Offline page behavior was not detected across sampled pages on https://www.barcelona.cat." }, { "area": "optimization", "urgency": "medium", "title": "Fix recurring optimization bloat at shared layer", "detail": "Serve images in next-gen formats recurs across 100 pages on https://www.barcelona.cat (est. 78.72 MB aggregate savings)." }, { "area": "compression", "urgency": "high", "title": "Prioritize recurring compression fixes", "detail": "Use modern image compression formats recurs across 100 pages on https://www.barcelona.cat (est. 78.72 MB aggregate savings)." }, { "area": "offline-support", "urgency": "high", "title": "Prioritize recurring offline/caching improvements", "detail": "Add service worker support is needed across 100 pages on https://www.barcelona.cat." } ], "recurringCompression": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "pageCount": 100, "totalEstimatedSavingsBytes": 82547754.59999993 }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "pageCount": 100, "totalEstimatedSavingsBytes": 56535750 }, { "id": "uses-text-compression", "title": "Enable Brotli/gzip for text assets", "urgency": "medium", "pageCount": 15, "totalEstimatedSavingsBytes": 459096 }, { "id": "unminified-javascript", "title": "Minify JavaScript before transfer", "urgency": "high", "pageCount": 8, "totalEstimatedSavingsBytes": 373352 }, { "id": "unminified-css", "title": "Minify CSS before transfer", "urgency": "low", "pageCount": 4, "totalEstimatedSavingsBytes": 14671 } ], "recurringOptimization": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "pageCount": 100, "totalEstimatedSavingsBytes": 82547754.59999993, "totalEstimatedBlockingMs": 0 }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "pageCount": 100, "totalEstimatedSavingsBytes": 56535750, "totalEstimatedBlockingMs": 0 }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "pageCount": 100, "totalEstimatedSavingsBytes": 14763726, "totalEstimatedBlockingMs": 0 }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "pageCount": 100, "totalEstimatedSavingsBytes": 13506657, "totalEstimatedBlockingMs": 0 }, { "id": "unused-css-rules", "title": "Remove unused CSS", "pageCount": 100, "totalEstimatedSavingsBytes": 9519046, "totalEstimatedBlockingMs": 0 }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "pageCount": 100, "totalEstimatedSavingsBytes": 0, "totalEstimatedBlockingMs": 150288 }, { "id": "uses-responsive-images", "title": "Right-size images for viewport", "pageCount": 32, "totalEstimatedSavingsBytes": 6360935, "totalEstimatedBlockingMs": 0 }, { "id": "uses-text-compression", "title": "Enable text compression", "pageCount": 15, "totalEstimatedSavingsBytes": 459096, "totalEstimatedBlockingMs": 0 }, { "id": "unminified-javascript", "title": "Minify JavaScript", "pageCount": 8, "totalEstimatedSavingsBytes": 373352, "totalEstimatedBlockingMs": 0 }, { "id": "unminified-css", "title": "Minify CSS", "pageCount": 4, "totalEstimatedSavingsBytes": 14671, "totalEstimatedBlockingMs": 0 } ], "recurringOfflineOpportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "pageCount": 100 }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "pageCount": 100 }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "pageCount": 100 }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "pageCount": 100 }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "pageCount": 100 } ], "recurringDependencies": [], "recurringRuntimeSignals": [], "pageSpecific": [ { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn/banys-i-platges/historia-de-les-platges", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 29, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.17 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1016.77 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.17 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1016.77 KB." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn/banos-y-playas/historia-de-las-playas", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 29, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.17 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1017.30 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.17 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1017.30 KB." } ] }, { "url": "https://barcelona.cat/es/vivir-en-bcn/vive-el-barrio", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 77, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.42 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 747.77 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.42 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 747.77 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/parks-and-gardens/history", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 25, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.45 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.23 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.45 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.23 MB." } ] }, { "url": "https://barcelona.cat/en/discoverbcn", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 97, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 27, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1013.03 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 832.52 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1013.03 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 832.52 KB." } ] }, { "url": "https://barcelona.cat/ca/coneixbcn", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 96, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 27, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1013.03 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 832.52 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1013.03 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 832.52 KB." } ] }, { "url": "https://barcelona.cat/es/conocebcn", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 96, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 27, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1013.03 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 832.52 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1013.03 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 832.52 KB." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn/banos-y-playas/playa-de-sant-miquel", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 83, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 39, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 702.57 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 603.45 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 702.57 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 603.45 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/bathing-and-beaches/sant-sebastia-beach", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 83, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 39, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 680.80 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 587.22 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 680.80 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 587.22 KB." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn/banos-y-playas/playa-de-somorrostro", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 83, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 39, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 720.24 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 618.58 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 720.24 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 618.58 KB." } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn/banys-i-platges/barcelona-platja-platja", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 21, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.16 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 983.25 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.16 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 983.25 KB." } ] }, { "url": "https://barcelona.cat/en/living-in-bcn/accessibility", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.08 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 916.72 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.08 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 916.72 KB." } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.32 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.10 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.32 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.10 MB." } ] }, { "url": "https://barcelona.cat/ca/treball-i-empresa", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 2.05 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.73 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 2.05 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.73 MB." } ] }, { "url": "https://barcelona.cat/ca/viure-a-bcn", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.28 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.00 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.28 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.00 MB." } ] }, { "url": "https://barcelona.cat/en/living-in-bcn", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.28 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.00 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.28 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.00 MB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.38 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.15 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.38 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.15 MB." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.32 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.10 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.32 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.10 MB." } ] }, { "url": "https://barcelona.cat/es/trabajo-y-empresa", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 2.05 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.73 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 2.05 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.73 MB." } ] }, { "url": "https://barcelona.cat/es/vivir-en-bcn", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.29 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.00 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.29 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.00 MB." } ] }, { "url": "https://barcelona.cat/en/discoverbcn/ciutadella-knowledge-hub/heritage-and-science-hub", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.86 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.55 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.86 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.55 MB." } ] }, { "url": "https://barcelona.cat/es/vivir-en-bcn/con-accesibilidad", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.08 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 916.28 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.08 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 916.28 KB." } ] }, { "url": "https://barcelona.cat/es/vivir-en-bcn/medio-ambiente-y-sostenibilidad", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.25 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.02 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.25 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.02 MB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/bathing-and-beaches/dogs-area", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.70 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.25 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.70 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.25 MB." } ] }, { "url": "https://barcelona.cat/es/vivir-en-bcn/con-ninos-y-ninas", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.87 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.43 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.87 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.43 MB." } ] }, { "url": "https://barcelona.cat/en/discoverbcn/ciutadella-knowledge-hub/greenhouse/history", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.88 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.51 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.88 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.51 MB." } ] }, { "url": "https://barcelona.cat/ca/viure-a-bcn/amb-nens-i-nenes", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 100, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.87 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.43 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.87 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.43 MB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/montjuic-park/find-out-about-montjuic-park-council", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 69, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 45, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 434.22 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 368.13 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 434.22 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 368.13 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/magic-fountain/history", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 94, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.09 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 853.31 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.09 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 853.31 KB." } ] }, { "url": "https://barcelona.cat/en/discoverbcn/ciutadella-knowledge-hub/transformation-park", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 93, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 985.67 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 826.38 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 985.67 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 826.38 KB." } ] }, { "url": "https://barcelona.cat/en/getinvolved", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 92, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 860.02 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 710.92 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 860.02 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 710.92 KB." } ] }, { "url": "https://barcelona.cat/en/living-in-bcn/diada", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 89, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 23, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 888.45 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 713.76 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 888.45 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 713.76 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/bathing-and-beaches/accessibility", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 66, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 45, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 419.54 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 353.70 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 419.54 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 353.70 KB." } ] }, { "url": "https://barcelona.cat/ca/implicat", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 91, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 860.41 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 711.26 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 860.41 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 711.26 KB." } ] }, { "url": "https://barcelona.cat/es/vivir-en-bcn/diada", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 88, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 23, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 888.45 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 713.76 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 888.45 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 713.76 KB." } ] }, { "url": "https://barcelona.cat/es/implicate", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 88, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 808.69 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 666.90 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 808.69 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 666.90 KB." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn/banos-y-playas/zona-de-banos-del-forum", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 63, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 42, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 433.65 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 371.77 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 433.65 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 371.77 KB." } ] }, { "url": "https://barcelona.cat/es/conocebcn/la-historia/la-barcino-romana", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 82, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 23, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 711.35 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 569.39 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 711.35 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 569.39 KB." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn/parque-montjuic/noticias", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 55, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.05 MB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 89.47 KB." }, { "title": "Right-size images for viewport", "urgency": "high", "detail": "Avoid sending larger images than the rendered size needs. Estimated byte savings: 1.06 MB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.05 MB." } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn/banys-i-platges/zona-de-banys-del-forum", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 63, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 42, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 433.65 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 371.77 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 433.65 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 371.77 KB." } ] }, { "url": "https://barcelona.cat/es/vivir-en-bcn/con-personas-mayores/vivir-con-tranquilidad", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 79, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 25, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 611.21 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 503.09 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 611.21 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 503.09 KB." } ] }, { "url": "https://barcelona.cat/en/discoverbcn/la-ciutadella-knowledge-hub/news", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 53, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 884.01 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 87.35 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 884.01 KB." }, { "title": "Right-size images for viewport", "urgency": "high", "detail": "Avoid sending larger images than the rendered size needs. Estimated byte savings: 826.77 KB." } ] }, { "url": "https://barcelona.cat/es/conocebcn/la-ciutadella-del-conocimiento/noticias", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 52, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 884.01 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 87.35 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 884.01 KB." }, { "title": "Right-size images for viewport", "urgency": "high", "detail": "Avoid sending larger images than the rendered size needs. Estimated byte savings: 814.66 KB." } ] }, { "url": "https://barcelona.cat/ca/viure-a-bcn/amb-nens-i-nenes/lleure/llistat-de-ludotecas", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 51, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 348.81 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 247.81 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "low", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 21.90 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 348.81 KB." } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn/cultura", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 53, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 48, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 500.10 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 275.98 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 500.10 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 275.98 KB." } ] }, { "url": "https://barcelona.cat/es/conocebcn/la-historia/la-barcelona-contemporanea", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 78, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 23, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 632.60 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 506.63 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 632.60 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 506.63 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/montjuic-park/news", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 50, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 867.69 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 89.47 KB." }, { "title": "Right-size images for viewport", "urgency": "high", "detail": "Avoid sending larger images than the rendered size needs. Estimated byte savings: 911.83 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 867.69 KB." } ] }, { "url": "https://barcelona.cat/en/living-in-bcn/pets", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 70, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 30, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.15 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 609.05 KB." }, { "title": "Minify JavaScript before transfer", "urgency": "low", "detail": "Minify JS bundles so transport compression produces better results with fewer bytes. Estimated savings: 5.93 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.15 MB." } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn/banys-i-platges/esport-les-platges", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 66, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 34, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 447.24 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 365.76 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 447.24 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 365.76 KB." } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn/banys-i-platges/activitats-esportives-organitzades-amb-anim-de-lucre", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 55, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 45, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 327.55 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 259.02 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 327.55 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 259.02 KB." } ] }, { "url": "https://barcelona.cat/ca/canelons", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 54, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 45, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 289.31 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 247.26 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 289.31 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 247.26 KB." } ] }, { "url": "https://barcelona.cat/ca/pagina-imatge-promocional", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 53, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 45, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 306.57 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 243.00 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 306.57 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 243.00 KB." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn/banos-y-playas/deporte-en-las-playas/pesca", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 53, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 45, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 305.74 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 243.80 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 305.74 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 243.80 KB." } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn/banys-i-platges/platges-sense-residus", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 64, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 34, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 430.14 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 361.06 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 430.14 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 361.06 KB." } ] }, { "url": "https://barcelona.cat/es/conocebcn/la-ciutadella-del-conocimiento", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 77, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 878.93 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 631.72 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 878.93 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 631.72 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/magic-fountain/how-it-works", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 76, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 21, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 620.91 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 484.34 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 620.91 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 484.34 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/bathing-and-beaches/sports-activities-organised-federated-athletes-entities", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 52, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 45, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 289.92 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 228.98 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 289.92 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 228.98 KB." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn/banos-y-playas/actividades-deportivas-organizadas-por-deportistas-federados", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 51, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 45, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 289.92 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 228.98 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 289.92 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 228.98 KB." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn/parque-montjuic/conoce-el-consejo-del-parque-de-montjuic", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 51, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 45, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 292.64 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 230.80 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 292.64 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 230.80 KB." } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn/estiu/refrescat-a-les-piscines-municipals", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 44, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 285.26 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 212.57 KB." }, { "title": "Lazy-load offscreen images", "urgency": "high", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 386.10 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 285.26 KB." } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn/banys-i-platges", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 68, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 26, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 3.78 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 879.22 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 3.78 MB." }, { "title": "Lazy-load offscreen images", "urgency": "high", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 3.60 MB." } ] }, { "url": "https://barcelona.cat/capdesetmana/ca/", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 43, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 596.62 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 168.83 KB." }, { "title": "Minify JavaScript before transfer", "urgency": "low", "detail": "Minify JS bundles so transport compression produces better results with fewer bytes. Estimated savings: 7.73 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 596.62 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/montjuic-park/activities/list", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 43, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 464.89 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 163.85 KB." }, { "title": "Lazy-load offscreen images", "urgency": "high", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 676.10 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 464.89 KB." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn/fuente-magica/horarios-de-la-fuente-magica", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 57, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 35, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.36 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 479.07 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "low", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 17.64 KB." }, { "title": "Minify JavaScript before transfer", "urgency": "low", "detail": "Minify JS bundles so transport compression produces better results with fewer bytes. Estimated savings: 4.20 KB." } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn/llistat", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 41, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 408.84 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 145.85 KB." }, { "title": "Lazy-load offscreen images", "urgency": "high", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 615.33 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 408.84 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/parks-and-gardens/belvederes", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 39, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 229.64 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 168.10 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "low", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 18.04 KB." }, { "title": "Lazy-load offscreen images", "urgency": "high", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 246.33 KB." } ] }, { "url": "https://barcelona.cat/en/discoverbcn/pics", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 52, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 29, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 804.59 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 295.32 KB." }, { "title": "Minify JavaScript before transfer", "urgency": "low", "detail": "Minify JS bundles so transport compression produces better results with fewer bytes. Estimated savings: 5.93 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 804.59 KB." } ] }, { "url": "https://barcelona.cat/en", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 58, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 3.07 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.90 MB." }, { "title": "Minify JavaScript before transfer", "urgency": "high", "detail": "Minify JS bundles so transport compression produces better results with fewer bytes. Estimated savings: 85.20 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "low", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 4.83 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/festes-majors", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 28, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 180.80 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 79.23 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "medium", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 32.97 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1595 ms." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/get-fit/sports-facilities", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 28, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 97.24 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "medium", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 85.81 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 77.76 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1958 ms." } ] }, { "url": "https://barcelona.cat/", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 57, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 3.07 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.90 MB." }, { "title": "Minify JavaScript before transfer", "urgency": "high", "detail": "Minify JS bundles so transport compression produces better results with fewer bytes. Estimated savings: 85.21 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "low", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 4.86 KB." } ] }, { "url": "https://barcelona.cat/ca", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 57, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 3.07 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.90 MB." }, { "title": "Minify JavaScript before transfer", "urgency": "high", "detail": "Minify JS bundles so transport compression produces better results with fewer bytes. Estimated savings: 85.20 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "low", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 4.86 KB." } ] }, { "url": "https://barcelona.cat/es", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 57, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 3.07 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.90 MB." }, { "title": "Minify JavaScript before transfer", "urgency": "high", "detail": "Minify JS bundles so transport compression produces better results with fewer bytes. Estimated savings: 85.20 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "low", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 4.86 KB." } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn/posat-en-forma/installacions-esportives", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 27, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 97.24 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "medium", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 86.13 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 77.76 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1564 ms." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn/ponte-en-forma/clubes", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 23, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Enable Brotli/gzip for text assets", "urgency": "medium", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 82.46 KB." }, { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1647 ms." } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn/parcs-i-jardins/parcs-forestals", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 22, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 140.47 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 69.00 KB." }, { "title": "Lazy-load offscreen images", "urgency": "high", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 211.18 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1608 ms." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn/parques-y-jardines/parques-forestales", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 22, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 140.47 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 69.00 KB." }, { "title": "Lazy-load offscreen images", "urgency": "high", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 211.18 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1592 ms." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn/cultura/teatros", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 20, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 94.65 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 73.12 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1032 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 117.07 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/culture/theatres", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 20, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 94.65 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 73.12 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1598 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 117.07 KB." } ] }, { "url": "https://barcelona.cat/es/blogoteca/condiciones-uso", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 18, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 68.86 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1487 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/summer/outdoor-films", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 18, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 83.64 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "low", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 16.11 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1931 ms." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn/ponte-en-forma/clubs-asociaciones-y-penas", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 18, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "low", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 24.83 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1596 ms." } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn/ponte-en-forma/federaciones", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 18, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "low", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 23.11 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1588 ms." } ] }, { "url": "https://barcelona.cat/en/living-in-bcn/environment-and-sustainability/list-containers", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 18, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "low", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 19.93 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1025 ms." } ] }, { "url": "https://barcelona.cat/ca/prova-video", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 17, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 79.88 KB." } ] }, { "url": "https://barcelona.cat/en/catalan-national-day-2022", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 22, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 45, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 122.82 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Serve images in next-gen formats", "urgency": "medium", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 122.82 KB." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." } ] }, { "url": "https://barcelona.cat/en/pagina-exemple-mapa-sant-jordi", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 17, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1482 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." } ] }, { "url": "https://barcelona.cat/es/diada-nacional-de-cataluna-2022", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 22, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 45, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 126.27 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Serve images in next-gen formats", "urgency": "medium", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 126.27 KB." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 81.70 KB." } ] }, { "url": "https://barcelona.cat/es/aviso-legal/banoasistido", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 17, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1483 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/parks-and-gardens/childrens-play-areas", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 16, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1649 ms." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 89.87 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/culture/cinemas", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 16, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1642 ms." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 89.76 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/summer/municipal-tax-office", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 16, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1624 ms." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 90.01 KB." } ] }, { "url": "https://barcelona.cat/es/conocebcn/ciutadelladelconocimiento/polo-de-biociencia-del-csic", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 46, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 251.85 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 213.89 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 251.85 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 213.89 KB." } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn/cultura/auditoris", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 15, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 2093 ms." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 89.76 KB." } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn/estiu/oficines-de-tramitacio-del-dni-i-passaport", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 15, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1790 ms." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 90.01 KB." } ] }, { "url": "https://barcelona.cat/ca/diada-nacional-de-catalunya-2022", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 19, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 45, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 96.72 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Serve images in next-gen formats", "urgency": "medium", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 96.72 KB." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 81.70 KB." } ] }, { "url": "https://barcelona.cat/es/conocebcn/ciutadelladelconocimiento/biblioteca-central", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 38, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 20, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 212.27 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 171.82 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 212.27 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1637 ms." } ] }, { "url": "https://barcelona.cat/en/living-in-bcn/catalan-national-day-2019/public-transport-11-september-2022-catalan-national-day", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 6, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 50, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1640 ms." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 79.69 KB." } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/magic-fountain/choreographies-magic-fountain", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 15, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 39, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1493 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." } ] }, { "url": "https://barcelona.cat/ca/viure-a-bcn/diada/transports-publics-durant-la-diada-2024", "securityScore": 59, "dependencyScore": 10, "expectedFilesScore": 25, "compressionScore": 6, "optimizationScore": 100, "offlineScore": 100, "languageScore": 0, "mediaHintsScore": 46, "urgency": "high", "topRecommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. 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"https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=iMz00G&url=https%3A%2F%2Fwww.barcelona.cat%2Fca", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "summary": { "pageStatus": "not-green", "externalOriginCount": 19, "greenCount": 7, "notGreenCount": 13, "unknownCount": 0 } }, "formValidation": { "score": 60, "urgency": "high", "pageElementOccurrences": 2, "uniqueElementsAssessed": 1, "reusedFromCacheCount": 0, "components": [ { "signature": "form|get|/ca|input|text|query|no-autocomplete|optional|no-pattern|no-minlength", "role": "form", "controlType": "text", "fieldName": "query", "formContext": "form|get|/ca", "hasLabel": true, "hasValidationRule": false, "hasErrorMessagingHook": false, "toolingFriendly": false, "assessment": { "score": 60, "urgency": "high", "issues": [ "No explicit validation rule", "No error messaging hook", "Missing autocomplete for tooling support" ], "recommendations": [ "Define validation constraints (required, pattern, min/max, or semantic input type).", "Add aria-errormessage/aria-describedby and a visible error region for invalid input.", "Provide meaningful autocomplete values to support browsers and assistive tooling." ] }, "reusedFromCache": false } ], "recommendations": [ { "title": "No explicit validation rule", "urgency": "medium", "detail": "1 unique form control signature(s) on this page include this issue." }, { "title": "No error messaging hook", "urgency": "medium", "detail": "1 unique form control signature(s) on this page include this issue." }, { "title": "Missing autocomplete for tooling support", "urgency": "medium", "detail": "1 unique form control signature(s) on this page include this issue." } ] }, "metadata": { "score": 0, "urgency": "low", "checks": { "hasTitle": true, "hasLang": true, "hasDescription": true, "hasCanonical": true, "hasOpenGraphCore": true, "hasTwitterCard": true, "hasViewport": true, "hasCharset": true, "hasValidStructuredData": true, "hasInvalidStructuredData": false }, "observed": { "title": "El portal web oficial de Barcelona | Ajuntament de Barcelona", "lang": "ca", "charset": "utf-8", "viewport": "width=device-width, initial-scale=1, shrink-to-fit=no", "description": "Portal oficial de Barcelona. Accediu als tràmits de l'administració, actualitat de serveis municipals, mobilitat, agenda cultural i recursos per viure i treballar a la ciutat.", "robots": "", "canonical": "https://www.barcelona.cat/ca", "ogTitle": "Barcelona.cat", "ogDescription": "Connecta amb Barcelona. Troba tota la informació pràctica per al dia a dia: des de tràmits i serveis públics fins a l'agenda de cultura i oci.", "ogType": "Web", "ogUrl": "https://www.barcelona.cat/ca/home", "twitterCard": "summary_large_image", "ldJsonCount": 0, "validLdJsonCount": 0, "invalidLdJsonCount": 0 }, "recommendations": [ { "title": "Metadata structure looks healthy", "urgency": "low", "detail": "Core machine-readable metadata is present and no structural issues were detected." } ] }, "layoutAdaptation": { "score": 42, "urgency": "medium", "checks": { "testedMobile": true, "testedTablet": true, "horizontalOverflowOnMobile": false, "horizontalOverflowOnTablet": false, "mobileSmallTapTargets": 64, "tabletSmallTapTargets": 59, "fixedWidthOffenders": 6, "oversizedMedia": 0, "scanErrors": 0 }, "perDevice": [ { "device": "mobile", "viewportWidth": 390, "viewportHeight": 844, "contentWidth": 390, "horizontalOverflowPx": 0, "hasHorizontalOverflow": false, "fixedWidthOffenders": 3, "smallTapTargets": 64, "oversizedMedia": 0 }, { "device": "tablet", "viewportWidth": 820, "viewportHeight": 1180, "contentWidth": 820, "horizontalOverflowPx": 0, "hasHorizontalOverflow": false, "fixedWidthOffenders": 3, "smallTapTargets": 59, "oversizedMedia": 0 } ], "recommendations": [ { "title": "Increase touch target sizes", "urgency": "high", "detail": "Ensure interactive controls are at least 44x44 CSS px. Detected 64 small targets on mobile and 59 on tablet." }, { "title": "Refactor fixed-width components", "urgency": "medium", "detail": "6 element(s) exceeded viewport width in tested layouts; use responsive component constraints." } ] }, "securityLight": { "score": 59, "urgency": "medium", "checks": { "isHttps": true, "hasHsts": false, "hasCsp": false, "hasXContentTypeOptions": true, "hasReferrerPolicy": false, "hasPermissionsPolicy": false, "exposesServerFingerprint": true, "externalScriptCount": 10, "externalScriptsWithoutIntegrity": 10, "vulnerableLibraryCount": 0 }, "observed": { "headers": { "cache-control": "max-age=300, public", "content-encoding": "gzip", "content-language": "ca", "content-length": "17847", "content-type": "text/html; charset=UTF-8", "date": "Mon, 13 Apr 2026 22:37:55 GMT", "etag": "\"1776119874-gzip\"", "expires": "Sun, 19 Nov 1978 05:00:00 GMT", "last-modified": "Mon, 13 Apr 2026 22:37:54 GMT", "server": "nginx", "vary": "Cookie,Accept-Encoding", "via": "1.1 575693ca51d2d9242d8177dfeb274d24.cloudfront.net (CloudFront)", "x-amz-cf-id": "2gQVbI8ysTW5-FC1R3NGY-NCUXV4mUOJ0Lzmg2mPTTTA6hHoJyPxyg==", "x-amz-cf-pop": "IAD12-P5", "x-cache": "Miss from cloudfront", "x-content-type-options": "nosniff", "x-frame-options": "SAMEORIGIN", "x-generator": "Drupal 10 (https://www.drupal.org)" }, "vulnerableLibrariesAuditScore": null, "vulnerableLibraries": [] }, "recommendations": [ { "title": "Add a Content-Security-Policy header", "urgency": "high", "detail": "Add an appropriate CSP to reduce script injection and resource loading risk." }, { "title": "Enable Strict-Transport-Security", "urgency": "medium", "detail": "Set a Strict-Transport-Security header to enforce HTTPS on repeat visits." }, { "title": "Define a Referrer-Policy", "urgency": "low", "detail": "Set a referrer policy to reduce unnecessary URL data leakage." }, { "title": "Define a Permissions-Policy", "urgency": "low", "detail": "Restrict browser capabilities to only what the application needs." }, { "title": "Add SRI to external scripts", "urgency": "medium", "detail": "10 external script tag(s) are missing integrity attributes." } ] }, "expectedFiles": { "score": 25, "urgency": "low", "origin": "https://www.barcelona.cat", "checks": [ { "path": "/robots.txt", "kind": "expected", "url": "https://www.barcelona.cat/robots.txt", "found": true, "status": 200, "contentType": "text/plain" }, { "path": "/sitemap.xml", "kind": "beneficial", "url": "https://www.barcelona.cat/sitemap.xml", "found": true, "status": 200, "contentType": "application/xml; charset=utf-8" }, { "path": "/.well-known/security.txt", "kind": "beneficial", "url": "https://www.barcelona.cat/.well-known/security.txt", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/manifest.webmanifest", "kind": "beneficial", "url": "https://www.barcelona.cat/manifest.webmanifest", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/favicon.ico", "kind": "beneficial", "url": "https://www.barcelona.cat/favicon.ico", "found": true, "status": 200, "contentType": "image/x-icon" } ], "recommendations": [ { "title": "Add beneficial discoverability and maintenance files", "urgency": "low", "detail": "Missing beneficial file(s): /.well-known/security.txt, /manifest.webmanifest." } ] }, "mediaHints": { "score": 20, "urgency": "low", "checks": { "hasDarkMode": false, "hasMetaColorScheme": false, "hasDarkModeQuery": false, "autoplayingMedia": [], "autoplayCount": 0, "unmutedAutoplayCount": 0, "totalImages": 52, "imagesWithLazy": 28, "imagesWithoutLazy": 24 }, "recommendations": [ { "title": "Add dark mode support", "urgency": "medium", "detail": "No prefers-color-scheme: dark media query or color-scheme meta tag was found. Dark mode reduces energy use on OLED screens and improves user choice." } ] }, "wsgCustom": { "score": 85, "urgency": "medium", "data": { "hasPrintStyles": true, "hasReducedMotion": true, "media": { "totalImages": 56, "lazyImages": 29, "totalIframes": 5, "lazyIframes": 0 }, "typography": { "primaryFont": "\"Source Sans Pro\", \"Helvetica Neue\", Helvetica, Arial, sans-serif", "usesSystemFont": true }, "tracking": { "count": 0, "scripts": [] }, "semantics": { "hasNavigation": true, "hasMainContent": true } }, "recommendations": [ { "guideline": "11.3", "title": "Incomplete media lazy loading", "urgency": "medium", "detail": "Only 29/56 images use loading=\"lazy\". Global lazy loading reduces initial data transfer and energy consumption.", "wsid": "11.lazy loading", "assessor": "script", "example": "\"Description\"\n\n" }, { "guideline": "2.4", "title": "Review User Journey Efficiency", "urgency": "investigate", "detail": "Have a human walk through the main user journeys and verify they require the fewest steps possible. Unnecessary steps waste user time and device energy. Look for redundant confirmations, forced account creation, and non-essential interstitials.", "wsid": "2.minimize non-essential content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#minimize-non-essential-content-interactivity-or-journeys", "assessor": "human" }, { "guideline": "2.6", "title": "Check for Engagement Traps", "urgency": "investigate", "detail": "Manually review the page for patterns that artificially prolong engagement: infinite scroll, autoplay carousels, sticky overlays, and notification permission prompts. These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human" }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human" }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 57, "urgency": "medium", "totalEstimatedSavingsBytes": 5313604.5, "checks": { "hasEffectiveTextCompression": false }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 3222951.5, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "estimatedSavingsBytes": 1994763, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." }, { "id": "unminified-javascript", "title": "Minify JavaScript before transfer", "urgency": "high", "estimatedSavingsBytes": 87250, "detail": "Minify JS bundles so transport compression produces better results with fewer bytes." }, { "id": "uses-text-compression", "title": "Enable Brotli/gzip for text assets", "urgency": "low", "estimatedSavingsBytes": 4973, "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip." }, { "id": "unminified-css", "title": "Minify CSS before transfer", "urgency": "low", "estimatedSavingsBytes": 3667, "detail": "Minification amplifies compression efficiency and reduces payload size." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 3.07 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.90 MB." }, { "title": "Minify JavaScript before transfer", "urgency": "high", "detail": "Minify JS bundles so transport compression produces better results with fewer bytes. Estimated savings: 85.21 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "low", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 4.86 KB." }, { "title": "Minify CSS before transfer", "urgency": "low", "detail": "Minification amplifies compression efficiency and reduces payload size. Estimated savings: 3.58 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 7924659.5, "totalEstimatedBlockingMs": 531, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 3222951.5, "estimatedBlockingMs": 0, "displayValue": "Est savings of 3,147 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 1994763, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,948 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 1929764, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,885 KiB", "urgency": "high", "sourceAuditId": "unused-javascript" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 327666, "estimatedBlockingMs": 0, "displayValue": "Est savings of 320 KiB", "urgency": "high", "sourceAuditId": "unused-css-rules" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 271571, "estimatedBlockingMs": 0, "displayValue": "Est savings of 265 KiB", "urgency": "high", "sourceAuditId": "offscreen-images" }, { "id": "unminified-javascript", "title": "Minify JavaScript", "detail": "Use minified production JS output to reduce payload size.", "estimatedSavingsBytes": 87250, "estimatedBlockingMs": 0, "displayValue": "Est savings of 85 KiB", "urgency": "high", "sourceAuditId": "unminified-javascript" }, { "id": "uses-responsive-images", "title": "Right-size images for viewport", "detail": "Avoid sending larger images than the rendered size needs.", "estimatedSavingsBytes": 82054, "estimatedBlockingMs": 0, "displayValue": "Est savings of 80 KiB", "urgency": "medium", "sourceAuditId": "uses-responsive-images" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 531, "displayValue": "Est savings of 530 ms", "urgency": "medium", "sourceAuditId": "render-blocking-resources" }, { "id": "uses-text-compression", "title": "Enable text compression", "detail": "Serve text assets with Brotli or gzip to remove avoidable transfer bloat.", "estimatedSavingsBytes": 4973, "estimatedBlockingMs": 0, "displayValue": "Est savings of 5 KiB", "urgency": "low", "sourceAuditId": "uses-text-compression" }, { "id": "unminified-css", "title": "Minify CSS", "detail": "Use minified production CSS output to reduce bytes in transit.", "estimatedSavingsBytes": 3667, "estimatedBlockingMs": 0, "displayValue": "Est savings of 4 KiB", "urgency": "low", "sourceAuditId": "unminified-css" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 3.07 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.90 MB." }, { "title": "Remove unused JavaScript", "urgency": "high", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 1.84 MB." }, { "title": "Remove unused CSS", "urgency": "high", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 319.99 KB." }, { "title": "Lazy-load offscreen images", "urgency": "high", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 265.21 KB." }, { "title": "Minify JavaScript", "urgency": "high", "detail": "Use minified production JS output to reduce payload size. Estimated byte savings: 85.21 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 10, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "10 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 3099457.8694250463 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 2.96 MB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 2.96 MB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. 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"categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused css", "urgency": "high", "estimatedSavingsBytes": 327666, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Enable and verify text compression", "urgency": "medium", "estimatedSavingsBytes": 4973, "auditId": "uses-text-compression", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 45, "urgency": "high", "totalTransferBytes": 9310236, "heavyRequestCount": 25, "heavyBytes": 7079089, "heavyRatio": 0.7603554840070649, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/platja_1920x540.jpg", "transferSize": 1071743, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://api.com-shi-va.barcelona.cat/other_bus/lines/?RECORRIDO=0&access_token=1UWeUzjkmvYh93M14bl7JvnNwVkJSK", "transferSize": 730670, "resourceType": "xhr", "mimeType": "application/json", "domain": "api.com-shi-va.barcelona.cat" }, { "url": "https://mobile.com-shi-va.barcelona.cat/assets/index-CiPq0rWH.js", "transferSize": 715819, "resourceType": "script", "mimeType": "text/javascript", "domain": "mobile.com-shi-va.barcelona.cat" }, { "url": "https://com-shi-va.barcelona.cat/assets/index-97beb0ec.js", "transferSize": 546231, "resourceType": "script", "mimeType": "text/javascript", "domain": "com-shi-va.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/gentgranmontserratolivella_1900x547_0.jpg", "transferSize": 498992, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/vistes_aeries_bcn_5_1900x547.jpg", "transferSize": 427875, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://api.com-shi-va.barcelona.cat/bus/lines/?RECORRIDO=0&access_token=1UWeUzjkmvYh93M14bl7JvnNwVkJSK", "transferSize": 278523, "resourceType": "xhr", "mimeType": "application/json", "domain": "api.com-shi-va.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/una-nena-en-banyador-es-refresca-a-la%20%281%29.jpg", "transferSize": 256040, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/estatics/geobcn/1.2/api-full-ca.js", "transferSize": 247011, "resourceType": "script", "mimeType": "text/javascript", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/estatics/geobcn/1.2/js/lib/openlayers/ol-6.15.1.js", "transferSize": 243725, "resourceType": "script", "mimeType": "text/javascript", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/cap_mobile/public/vistes_aeries_bcn_5_1900x547.jpg?itok=h0iRuX1p", "transferSize": 227521, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://mobile.com-shi-va.barcelona.cat/assets/index-DFDXDFpa.css", "transferSize": 220925, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "mobile.com-shi-va.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/cap_mobile/public/platja_1024x400.jpg?itok=LXkeezfq", "transferSize": 209926, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/cap_mobile/public/una-nena-en-banyador-es-refresca-a-la%20%281%29.jpg?itok=Kgm8Kyg7", "transferSize": 202202, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://maps.googleapis.com/maps/api/js?key=AIzaSyA1hYiZ1NN9YNkxQPWfVHYhI7hmS1JLlLI&libraries=places%2Cgeometry&language=ca&v=3.47&callback=vueGoogleMapsInit", "transferSize": 186127, "resourceType": "script", "mimeType": "text/javascript", "domain": "maps.googleapis.com" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/cap_mobile/public/gentgranmontserratolivella_1900x547_0.jpg?itok=WhrMktlq", "transferSize": 175528, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/Banner_Municipals_252x252_CAT%20%281%29.png", "transferSize": 157624, "resourceType": "image", "mimeType": "image/png", "domain": "www.barcelona.cat" }, { "url": "https://releases.jquery.com/git/ui/jquery-ui-git.js", "transferSize": 126719, "resourceType": "script", "mimeType": "application/javascript", "domain": "releases.jquery.com" }, { "url": "https://www.barcelona.cat/sites/default/files/ICUB_WebBarcelona_252x252px_0.png", "transferSize": 110522, "resourceType": "image", "mimeType": "image/png", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/estatics-planol/v1.2/library/jquery-ui-1.10.4.js", "transferSize": 109123, "resourceType": "script", "mimeType": "text/javascript", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "image", "count": 10, "transferBytes": 3337973 }, { "resourceType": "script", "count": 8, "transferBytes": 2251355 }, { "resourceType": "xhr", "count": 2, "transferBytes": 1009193 }, { "resourceType": "stylesheet", "count": 3, "transferBytes": 335058 }, { "resourceType": "font", "count": 2, "transferBytes": 145510 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 16, "transferBytes": 4135288 }, { "domain": "api.com-shi-va.barcelona.cat", "count": 2, "transferBytes": 1009193 }, { "domain": "mobile.com-shi-va.barcelona.cat", "count": 2, "transferBytes": 936744 }, { "domain": "com-shi-va.barcelona.cat", "count": 2, "transferBytes": 608418 }, { "domain": "maps.googleapis.com", "count": 1, "transferBytes": 186127 }, { "domain": "releases.jquery.com", "count": 1, "transferBytes": 126719 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76600 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "high", "estimatedSavingsBytes": 271571, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "high", "estimatedSavingsBytes": 1929764, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "medium", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 1071743, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/platja_1920x540.jpg", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy xhr asset from api.com-shi-va.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 730670, "strategy": "Move this asset behind an explicit interaction, route boundary, or lazy-loading trigger.", "url": "https://api.com-shi-va.barcelona.cat/other_bus/lines/?RECORRIDO=0&access_token=1UWeUzjkmvYh93M14bl7JvnNwVkJSK", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from mobile.com-shi-va.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 715819, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://mobile.com-shi-va.barcelona.cat/assets/index-CiPq0rWH.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0, "displayValue": "15.1 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 15.1 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0, "displayValue": "16.3 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 16.3 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 1,885 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 1,885 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 320 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 320 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 3,147 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 3,147 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 1,948 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 1,948 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 265 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 265 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 530 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 530 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0, "displayValue": "1,638 elements", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,638 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-text-compression", "title": "Enable text compression", "description": "Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes. [Learn more about text compression](https://developer.chrome.com/docs/lighthouse/performance/uses-text-compression/).", "score": 0.5, "displayValue": "Est savings of 5 KiB", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Enable text compression\n\n- Lighthouse audit: uses-text-compression\n- Current value: Est savings of 5 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nText-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes. [Learn more about text compression](https://developer.chrome.com/docs/lighthouse/performance/uses-text-compression/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "total-byte-weight", "title": "Avoid enormous network payloads", "description": "Large network payloads cost users real money and are highly correlated with long load times. [Learn how to reduce payload sizes](https://developer.chrome.com/docs/lighthouse/performance/total-byte-weight/).", "score": 0.5, "displayValue": "Total size was 9,092 KiB", "impact": "medium", "wsg": { "categoryId": "5", "categoryName": "Business Strategy And Product Management", "id": "25", "title": "Define performance and environmental budgets", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#define-performance-and-environmental-budgets", "subheading": "Set budgets, taking people, planet, and performance into account alongside baselines, targets, evidence, and resources to help meet KPIs." }, "assessor": "script", "issueTemplate": "## Improve Avoid enormous network payloads\n\n- Lighthouse audit: total-byte-weight\n- Current value: Total size was 9,092 KiB\n- WSG guideline: 25 Define performance and environmental budgets\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#define-performance-and-environmental-budgets\n\n### Why this matters\nLarge network payloads cost users real money and are highly correlated with long load times. [Learn how to reduce payload sizes](https://developer.chrome.com/docs/lighthouse/performance/total-byte-weight/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/en/living-in-bcn/accessibility", "status": "ok", "finalUrl": "https://www.barcelona.cat/en/living-in-bcn/accessibility", "performanceScore": 0.5, "bestPracticesScore": 1, "transferBytes": 2030435, "co2Grams": 0.7778218824090001, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", 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Detected 64 small targets on mobile and 60 on tablet." } ] }, "securityLight": { "score": 59, "urgency": "medium", "checks": { "isHttps": true, "hasHsts": false, "hasCsp": false, "hasXContentTypeOptions": true, "hasReferrerPolicy": false, "hasPermissionsPolicy": false, "exposesServerFingerprint": true, "externalScriptCount": 7, "externalScriptsWithoutIntegrity": 7, "vulnerableLibraryCount": 0 }, "observed": { "headers": { "cache-control": "max-age=300, public", "content-encoding": "gzip", "content-language": "en", "content-length": "13563", "content-type": "text/html; charset=UTF-8", "date": "Mon, 13 Apr 2026 22:38:17 GMT", "etag": "\"1776119891-gzip\"", "expires": "Sun, 19 Nov 1978 05:00:00 GMT", "last-modified": "Mon, 13 Apr 2026 22:38:11 GMT", "server": "nginx", "vary": "Cookie,Accept-Encoding", "via": "1.1 575693ca51d2d9242d8177dfeb274d24.cloudfront.net (CloudFront)", "x-amz-cf-id": "wMUAsVO3jOMz5hPphHdxw3AIomKj7us3dt_rkpDQkPmDejbwgNXCEw==", "x-amz-cf-pop": "IAD12-P5", "x-cache": "Miss from cloudfront", "x-content-type-options": "nosniff", "x-frame-options": "SAMEORIGIN", "x-generator": "Drupal 10 (https://www.drupal.org)" }, "vulnerableLibrariesAuditScore": null, "vulnerableLibraries": [] }, "recommendations": [ { "title": "Add a Content-Security-Policy header", "urgency": "high", "detail": "Add an appropriate CSP to reduce script injection and resource loading risk." }, { "title": "Enable Strict-Transport-Security", "urgency": "medium", "detail": "Set a Strict-Transport-Security header to enforce HTTPS on repeat visits." }, { "title": "Define a Referrer-Policy", "urgency": "low", "detail": "Set a referrer policy to reduce unnecessary URL data leakage." }, { "title": "Define a Permissions-Policy", "urgency": "low", "detail": "Restrict browser capabilities to only what the application needs." }, { "title": "Add SRI to external scripts", "urgency": "medium", "detail": "7 external script tag(s) are missing integrity attributes." } ] }, "expectedFiles": { "score": 25, "urgency": "low", "origin": "https://www.barcelona.cat", "checks": [ { "path": "/robots.txt", "kind": "expected", "url": "https://www.barcelona.cat/robots.txt", "found": true, "status": 200, "contentType": "text/plain" }, { "path": "/sitemap.xml", "kind": "beneficial", "url": "https://www.barcelona.cat/sitemap.xml", "found": true, "status": 200, "contentType": "application/xml; charset=utf-8" }, { "path": "/.well-known/security.txt", "kind": "beneficial", "url": "https://www.barcelona.cat/.well-known/security.txt", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/manifest.webmanifest", "kind": "beneficial", "url": "https://www.barcelona.cat/manifest.webmanifest", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/favicon.ico", "kind": "beneficial", "url": "https://www.barcelona.cat/favicon.ico", "found": true, "status": 200, "contentType": "image/x-icon" } ], "recommendations": [ { "title": "Add beneficial discoverability and maintenance files", "urgency": "low", "detail": "Missing beneficial file(s): /.well-known/security.txt, /manifest.webmanifest." } ] }, "mediaHints": { "score": 20, "urgency": "low", "checks": { "hasDarkMode": false, "hasMetaColorScheme": false, "hasDarkModeQuery": false, "autoplayingMedia": [], "autoplayCount": 0, "unmutedAutoplayCount": 0, "totalImages": 24, "imagesWithLazy": 13, "imagesWithoutLazy": 11 }, "recommendations": [ { "title": "Add dark mode support", "urgency": "medium", "detail": "No prefers-color-scheme: dark media query or color-scheme meta tag was found. 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Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 2069871.6000000003, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 1131151.6000000003, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "estimatedSavingsBytes": 938720, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.08 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 916.72 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 2215132.6000000006, "totalEstimatedBlockingMs": 897, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 1131151.6000000003, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,105 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 938720, "estimatedBlockingMs": 0, "displayValue": "Est savings of 917 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 83634, "estimatedBlockingMs": 0, "displayValue": "Est savings of 82 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 58179, "estimatedBlockingMs": 0, "displayValue": "Est savings of 57 KiB", "urgency": "medium", "sourceAuditId": "unused-javascript" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 897, "displayValue": "Est savings of 900 ms", "urgency": "medium", "sourceAuditId": "render-blocking-resources" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 3448, "estimatedBlockingMs": 0, "displayValue": "Est savings of 3 KiB", "urgency": "low", "sourceAuditId": "offscreen-images" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.08 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 916.72 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 81.67 KB." }, { "title": "Remove unused JavaScript", "urgency": "medium", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 56.82 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "medium", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 897 ms." }, { "title": "Lazy-load offscreen images", "urgency": "low", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 3.37 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 168044.40876396644 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.11 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.11 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 8, "urgency": "medium", "transferBytes": 2030435, "css": { "unusedBytes": 83634, "ratio": 0.04119018830940168, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 58179, "duplicatedBytes": 0, "ratio": 0.028653465882926565, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.25, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 83634, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 58179, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 11, "urgency": "medium", "transferBytes": 2030435, "estimatedDeferrableBytes": 145261, "renderBlockingMs": 897, "breakdown": { "offscreenImageSavings": 3448, "unusedJavascriptSavings": 58179, "unusedCssSavings": 83634 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 3448, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 58179, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "high", "estimatedSavingsBytes": 83634, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "medium", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 897, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 144830, "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/amb%20accessibilitat-lleure-platges.jpg?itok=sCf3newI", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139463, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76424, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15566, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7150, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5447, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=n0yJoX&url=https%3A%2F%2Fwww.barcelona.cat%2Fen%2Fliving-in-bcn%2Faccessibility", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 24, "urgency": "medium", "transferBytes": 2030435, "estimatedRedundantBytes": 141813, "redundancyRatio": 0.06984365419232824, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 83634, "displayValue": "Est savings of 82 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 58179, "displayValue": "Est savings of 57 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 83634, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 58179, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 27, "urgency": "high", 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pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.03, "displayValue": "7.8 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 7.8 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.06, "displayValue": "10.9 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 10.9 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 57 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 57 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 82 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 82 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 1,105 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 1,105 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 917 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 917 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 900 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 900 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "server-response-time", "title": "Reduce initial server response time", "description": "Keep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).", "score": 0, "displayValue": "Root document took 5,540 ms", "impact": "high", "wsg": { "categoryId": "4", "categoryName": "Hosting, Infrastructure, and Systems", "id": "11", "title": "Ensure infrastructure fits project requirements", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements", "subheading": "Maintain the infrastructure you require rather than over-provisioning. Autoscale to meet demand and preserve hardware resources." }, "assessor": "script", "issueTemplate": "## Improve Reduce initial server response time\n\n- Lighthouse audit: server-response-time\n- Current value: Root document took 5,540 ms\n- WSG guideline: 11 Ensure infrastructure fits project requirements\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements\n\n### Why this matters\nKeep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0, "displayValue": "1,123 elements", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,123 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0.5, "displayValue": "Est savings of 3 KiB", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 3 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/bathing-and-beaches/accessibility", "status": "ok", "finalUrl": "https://www.barcelona.cat/en/what-to-do-in-bcn/bathing-and-beaches/accessibility", "performanceScore": 0.48, "bestPracticesScore": 1, "transferBytes": 1202255, "co2Grams": 0.460561528557, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": 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Estimated byte savings: 45.50 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 168042.21417597766 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.10 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.10 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 6, "urgency": "medium", "transferBytes": 1202255, "css": { "unusedBytes": 81071, "ratio": 0.06743244985464814, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 32481, "duplicatedBytes": 0, "ratio": 0.027016731059550596, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 81071, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 19, "urgency": "high", "transferBytes": 1202255, "estimatedDeferrableBytes": 200663, "renderBlockingMs": 1469, "breakdown": { "offscreenImageSavings": 87111, "unusedJavascriptSavings": 32481, "unusedCssSavings": 81071 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 87111, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "medium", "estimatedSavingsBytes": 81071, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1469, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "high", "estimatedSavingsBytes": 412842, "url": "https://www.barcelona.cat/sites/default/files/styles/galeria_medium/public/banyassistencia_710x379_1.jpg?itok=6FNgJCGu", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90562, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy script from cdn.matomo.cloud", "area": "script", "urgency": "medium", "estimatedSavingsBytes": 76427, "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139483, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76427, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15572, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7161, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5447, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=FoA5z2&url=https%3A%2F%2Fwww.barcelona.cat%2Fen%2Fwhat-to-do-in-bcn%2Fbathing-and-beaches%2Faccessibility", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 15, "urgency": "low", "transferBytes": 1202255, "estimatedRedundantBytes": 113552, "redundancyRatio": 0.09444918091419874, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 81071, "displayValue": "Est savings of 79 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 32481, "displayValue": "Est savings of 32 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 81071, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 30, "urgency": "medium", "totalTransferBytes": 1202255, "heavyRequestCount": 5, "heavyBytes": 683859, "heavyRatio": 0.5688136044349992, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/styles/galeria_medium/public/banyassistencia_710x379_1.jpg?itok=6FNgJCGu", "transferSize": 412842, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90562, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76427, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54921, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_evpTRQTawGYS1Ro7RbXq3hBxwat7AU-RJm1V8ZgzeaE.css?delta=5&language=en&theme=barcelonacat_theme&include=eJyFzsGKwzAMBNAfiuvDfpAZOyJxcSQjydn272sodFnIsieJmXcY3Ac7DmJPOKuJxfcJ6HXJ0EJNGAWe5CTVupLFqUdwkTb7v0zHRuGs9P0b-E4HxSzi5oqeyspXYGuS0YL5s1XerkQtEvDZfiVMxsySgS19_Qe6ypILp8kU8fMlejgpoy0dim0u3i2uOjra7Se5De4jt2o7rYs9zemIGUYvwgyJSg&tcut5n", "transferSize": 49107, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "image", "count": 1, "transferBytes": 412842 }, { "resourceType": "font", "count": 2, "transferBytes": 145483 }, { "resourceType": "script", "count": 1, "transferBytes": 76427 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 49107 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 4, "transferBytes": 607432 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76427 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 87111, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 412842, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/galeria_medium/public/banyassistencia_710x379_1.jpg?itok=6FNgJCGu", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90562, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76427, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.05, "displayValue": "7.3 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 7.3 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 79 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 79 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 420 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 420 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 354 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 354 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 85 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 85 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,470 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,470 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.86, "displayValue": "3.6 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.6 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0.5, "displayValue": "Est savings of 32 KiB", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 32 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "1,048 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,048 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/en/what-to-do-in-bcn/montjuic-park/find-out-about-montjuic-park-council", "status": "ok", "finalUrl": "https://www.barcelona.cat/en/what-to-do-in-bcn/montjuic-park/find-out-about-montjuic-park-council", "performanceScore": 0.52, "bestPracticesScore": 1, "transferBytes": 1184464, "co2Grams": 0.45374612736960007, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, 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"id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 19, "urgency": "high", "transferBytes": 1184464, "estimatedDeferrableBytes": 196899, "renderBlockingMs": 1408, "breakdown": { "offscreenImageSavings": 83661, "unusedJavascriptSavings": 31899, "unusedCssSavings": 81339 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 31899, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "medium", "estimatedSavingsBytes": 81339, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1408, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "high", "estimatedSavingsBytes": 426513, "url": "https://www.barcelona.cat/sites/default/files/styles/galeria_medium/public/consell_parc.jpg?itok=gL7I6i2n", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90570, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy script from cdn.matomo.cloud", "area": "script", "urgency": "medium", "estimatedSavingsBytes": 76592, "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139873, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76592, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15571, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7163, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5670, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2862, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=iiivcx&url=https%3A%2F%2Fwww.barcelona.cat%2Fen%2Fwhat-to-do-in-bcn%2Fmontjuic-park%2Ffind-out-about-montjuic-park-council", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 15, "urgency": "low", "transferBytes": 1184464, "estimatedRedundantBytes": 113238, "redundancyRatio": 0.0956027367653217, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 81339, "displayValue": "Est savings of 79 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 31899, "displayValue": "Est savings of 31 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 81339, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 31899, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 31, "urgency": "medium", "totalTransferBytes": 1184464, "heavyRequestCount": 5, "heavyBytes": 697709, "heavyRatio": 0.5890504059220035, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/styles/galeria_medium/public/consell_parc.jpg?itok=gL7I6i2n", "transferSize": 426513, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90570, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76592, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54929, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_evpTRQTawGYS1Ro7RbXq3hBxwat7AU-RJm1V8ZgzeaE.css?delta=5&language=en&theme=barcelonacat_theme&include=eJyFzsGKwzAMBNAfiuvDfpAZOyJxcSQjydn272sodFnIsieJmXcY3Ac7DmJPOKuJxfcJ6HXJ0EJNGAWe5CTVupLFqUdwkTb7v0zHRuGs9P0b-E4HxSzi5oqeyspXYGuS0YL5s1XerkQtEvDZfiVMxsySgS19_Qe6ypILp8kU8fMlejgpoy0dim0u3i2uOjra7Se5De4jt2o7rYs9zemIGUYvwgyJSg&tcut5n", "transferSize": 49105, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "image", "count": 1, "transferBytes": 426513 }, { "resourceType": "font", "count": 2, "transferBytes": 145499 }, { "resourceType": "script", "count": 1, "transferBytes": 76592 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 49105 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 4, "transferBytes": 621117 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76592 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 426513, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/galeria_medium/public/consell_parc.jpg?itok=gL7I6i2n", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90570, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76592, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0, "displayValue": "10.4 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 10.4 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 31 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 31 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 79 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 79 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 434 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 434 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 368 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 368 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 82 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 82 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,410 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,410 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-rel-preconnect", "title": "Preconnect to required origins", "description": "Consider adding `preconnect` or `dns-prefetch` resource hints to establish early connections to important third-party origins. [Learn how to preconnect to required origins](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/).", "score": 0, "displayValue": "Est savings of 330 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Preconnect to required origins\n\n- Lighthouse audit: uses-rel-preconnect\n- Current value: Est savings of 330 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nConsider adding `preconnect` or `dns-prefetch` resource hints to establish early connections to important third-party origins. [Learn how to preconnect to required origins](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.75, "displayValue": "4.4 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 4.4 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "939 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 939 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). 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Estimated savings: 3.58 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 7928606.5, "totalEstimatedBlockingMs": 1426, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 3222951.5, "estimatedBlockingMs": 0, "displayValue": "Est savings of 3,147 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 1994763, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,948 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 1933763, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,888 KiB", "urgency": "high", "sourceAuditId": "unused-javascript" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 327636, "estimatedBlockingMs": 0, "displayValue": "Est savings of 320 KiB", "urgency": "high", "sourceAuditId": "unused-css-rules" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 271551, "estimatedBlockingMs": 0, "displayValue": "Est savings of 265 KiB", "urgency": "high", "sourceAuditId": "offscreen-images" }, { "id": "unminified-javascript", "title": "Minify JavaScript", "detail": "Use minified production JS output to reduce payload size.", "estimatedSavingsBytes": 87247, "estimatedBlockingMs": 0, "displayValue": "Est savings of 85 KiB", "urgency": "high", "sourceAuditId": "unminified-javascript" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1426, "displayValue": "Est savings of 1,430 ms", "urgency": "high", "sourceAuditId": "render-blocking-resources" }, { "id": "uses-responsive-images", "title": "Right-size images for viewport", "detail": "Avoid sending larger images than the rendered size needs.", "estimatedSavingsBytes": 82054, "estimatedBlockingMs": 0, "displayValue": "Est savings of 80 KiB", "urgency": "medium", "sourceAuditId": "uses-responsive-images" }, { "id": "uses-text-compression", "title": "Enable text compression", "detail": "Serve text assets with Brotli or gzip to remove avoidable transfer bloat.", "estimatedSavingsBytes": 4972, "estimatedBlockingMs": 0, "displayValue": "Est savings of 5 KiB", "urgency": "low", "sourceAuditId": "uses-text-compression" }, { "id": "unminified-css", "title": "Minify CSS", "detail": "Use minified production CSS output to reduce bytes in transit.", "estimatedSavingsBytes": 3669, "estimatedBlockingMs": 0, "displayValue": "Est savings of 4 KiB", "urgency": "low", "sourceAuditId": "unminified-css" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. 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Estimated byte savings: 85.20 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 10, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "10 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 3095624.071659684 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 2.95 MB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 2.95 MB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. 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This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 327636, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "high", "estimatedSavingsBytes": 1933763, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 22, "urgency": "high", "transferBytes": 9304565, "estimatedDeferrableBytes": 2532950, "renderBlockingMs": 1426, "breakdown": { "offscreenImageSavings": 271551, "unusedJavascriptSavings": 1933763, "unusedCssSavings": 327636 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "high", "estimatedSavingsBytes": 271551, 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"title": "Evaluate deferred loading for heavy script from mobile.com-shi-va.barcelona.cat", "area": "script", "urgency": "high", "estimatedSavingsBytes": 715602, "url": "https://mobile.com-shi-va.barcelona.cat/assets/index-CiPq0rWH.js", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy script from com-shi-va.barcelona.cat", "area": "script", "urgency": "high", "estimatedSavingsBytes": 546241, "url": "https://com-shi-va.barcelona.cat/assets/index-97beb0ec.js", "strategy": "Confirm this asset is required for first paint; 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"categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused css", "urgency": "high", "estimatedSavingsBytes": 327636, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Enable and verify text compression", "urgency": "medium", "estimatedSavingsBytes": 4972, "auditId": "uses-text-compression", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": 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"domain": "mobile.com-shi-va.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/cap_mobile/public/platja_1024x400.jpg?itok=LXkeezfq", "transferSize": 209916, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/cap_mobile/public/una-nena-en-banyador-es-refresca-a-la%20%281%29.jpg?itok=Kgm8Kyg7", "transferSize": 202153, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://maps.googleapis.com/maps/api/js?key=AIzaSyA1hYiZ1NN9YNkxQPWfVHYhI7hmS1JLlLI&libraries=places%2Cgeometry&language=ca&v=3.47&callback=vueGoogleMapsInit", "transferSize": 186125, "resourceType": "script", "mimeType": "text/javascript", "domain": "maps.googleapis.com" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/cap_mobile/public/gentgranmontserratolivella_1900x547_0.jpg?itok=WhrMktlq", "transferSize": 175518, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/Banner_Municipals_252x252_CAT%20%281%29.png", "transferSize": 157622, "resourceType": "image", "mimeType": "image/png", "domain": "www.barcelona.cat" }, { "url": "https://releases.jquery.com/git/ui/jquery-ui-git.js", "transferSize": 126719, "resourceType": "script", "mimeType": "application/javascript", "domain": "releases.jquery.com" }, { "url": "https://www.barcelona.cat/sites/default/files/ICUB_WebBarcelona_252x252px_0.png", "transferSize": 110511, "resourceType": "image", "mimeType": "image/png", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/estatics-planol/v1.2/library/jquery-ui-1.10.4.js", "transferSize": 109118, "resourceType": "script", "mimeType": "text/javascript", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "image", "count": 10, "transferBytes": 3337900 }, { "resourceType": "script", "count": 8, "transferBytes": 2251184 }, { "resourceType": "xhr", "count": 2, "transferBytes": 1009858 }, { "resourceType": "stylesheet", "count": 3, "transferBytes": 335039 }, { "resourceType": "font", "count": 2, "transferBytes": 145491 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 16, "transferBytes": 4135241 }, { "domain": "api.com-shi-va.barcelona.cat", "count": 2, "transferBytes": 1009858 }, { "domain": "mobile.com-shi-va.barcelona.cat", "count": 2, "transferBytes": 936507 }, { "domain": "com-shi-va.barcelona.cat", "count": 2, "transferBytes": 608431 }, { "domain": "maps.googleapis.com", "count": 1, "transferBytes": 186125 }, { "domain": "releases.jquery.com", "count": 1, "transferBytes": 126719 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76591 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "high", "estimatedSavingsBytes": 271551, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "high", "estimatedSavingsBytes": 1933763, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 1071769, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/platja_1920x540.jpg", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy xhr asset from api.com-shi-va.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 730853, "strategy": "Move this asset behind an explicit interaction, route boundary, or lazy-loading trigger.", "url": "https://api.com-shi-va.barcelona.cat/other_bus/lines/?RECORRIDO=0&access_token=1UWeUzjkmvYh93M14bl7JvnNwVkJSK", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from mobile.com-shi-va.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 715602, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://mobile.com-shi-va.barcelona.cat/assets/index-CiPq0rWH.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0, "displayValue": "18.1 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 18.1 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.27, "displayValue": "7.5 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 7.5 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 1,888 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 1,888 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 320 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 320 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 3,147 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 3,147 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 1,948 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 1,948 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 265 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 265 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,430 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,430 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0, "displayValue": "1,638 elements", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,638 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-text-compression", "title": "Enable text compression", "description": "Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes. [Learn more about text compression](https://developer.chrome.com/docs/lighthouse/performance/uses-text-compression/).", "score": 0.5, "displayValue": "Est savings of 5 KiB", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Enable text compression\n\n- Lighthouse audit: uses-text-compression\n- Current value: Est savings of 5 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nText-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes. [Learn more about text compression](https://developer.chrome.com/docs/lighthouse/performance/uses-text-compression/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "total-byte-weight", "title": "Avoid enormous network payloads", "description": "Large network payloads cost users real money and are highly correlated with long load times. [Learn how to reduce payload sizes](https://developer.chrome.com/docs/lighthouse/performance/total-byte-weight/).", "score": 0.5, "displayValue": "Total size was 9,086 KiB", "impact": "medium", "wsg": { "categoryId": "5", "categoryName": "Business Strategy And Product Management", "id": "25", "title": "Define performance and environmental budgets", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#define-performance-and-environmental-budgets", "subheading": "Set budgets, taking people, planet, and performance into account alongside baselines, targets, evidence, and resources to help meet KPIs." }, "assessor": "script", "issueTemplate": "## Improve Avoid enormous network payloads\n\n- Lighthouse audit: total-byte-weight\n- Current value: Total size was 9,086 KiB\n- WSG guideline: 25 Define performance and environmental budgets\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#define-performance-and-environmental-budgets\n\n### Why this matters\nLarge network payloads cost users real money and are highly correlated with long load times. 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"transferBytes": 807, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=7pvCms&url=https%3A%2F%2Fwww.barcelona.cat%2Fen", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "summary": { "pageStatus": "not-green", "externalOriginCount": 19, "greenCount": 7, "notGreenCount": 13, "unknownCount": 0 } }, "formValidation": { "score": 56.666666666666664, "urgency": "medium", "pageElementOccurrences": 5, "uniqueElementsAssessed": 3, "reusedFromCacheCount": 2, "components": [ { "signature": "form|get|/en|input|text|query|no-autocomplete|optional|no-pattern|no-minlength", "role": "form", "controlType": "text", 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Find all the practical information for day-to-day life: from procedures and public services to the cultural and entertainment calendar.", "ogType": "Web", "ogUrl": "https://www.barcelona.cat/en/home", "twitterCard": "summary_large_image", "ldJsonCount": 0, "validLdJsonCount": 0, "invalidLdJsonCount": 0 }, "recommendations": [ { "title": "Metadata structure looks healthy", "urgency": "low", "detail": "Core machine-readable metadata is present and no structural issues were detected." } ] }, "layoutAdaptation": { "score": 42, "urgency": "medium", "checks": { "testedMobile": true, "testedTablet": true, "horizontalOverflowOnMobile": false, "horizontalOverflowOnTablet": false, "mobileSmallTapTargets": 64, "tabletSmallTapTargets": 58, "fixedWidthOffenders": 6, "oversizedMedia": 0, "scanErrors": 0 }, "perDevice": [ { "device": "mobile", "viewportWidth": 390, "viewportHeight": 844, "contentWidth": 390, "horizontalOverflowPx": 0, "hasHorizontalOverflow": false, "fixedWidthOffenders": 3, "smallTapTargets": 64, "oversizedMedia": 0 }, { "device": "tablet", "viewportWidth": 820, "viewportHeight": 1180, "contentWidth": 820, "horizontalOverflowPx": 0, "hasHorizontalOverflow": false, "fixedWidthOffenders": 3, "smallTapTargets": 58, "oversizedMedia": 0 } ], "recommendations": [ { "title": "Increase touch target sizes", "urgency": "high", "detail": "Ensure interactive controls are at least 44x44 CSS px. Detected 64 small targets on mobile and 58 on tablet." }, { "title": "Refactor fixed-width components", "urgency": "medium", "detail": "6 element(s) exceeded viewport width in tested layouts; use responsive component constraints." } ] }, "securityLight": { "score": 59, "urgency": "medium", "checks": { "isHttps": true, "hasHsts": false, "hasCsp": false, "hasXContentTypeOptions": true, "hasReferrerPolicy": false, "hasPermissionsPolicy": false, "exposesServerFingerprint": true, "externalScriptCount": 10, "externalScriptsWithoutIntegrity": 10, "vulnerableLibraryCount": 0 }, "observed": { "headers": { "cache-control": "max-age=300, public", "content-encoding": "gzip", "content-language": "en", "content-length": "17789", "content-type": "text/html; charset=UTF-8", "date": "Mon, 13 Apr 2026 22:39:28 GMT", "etag": "\"1776119967-gzip\"", "expires": "Sun, 19 Nov 1978 05:00:00 GMT", "last-modified": "Mon, 13 Apr 2026 22:39:27 GMT", "server": "nginx", "vary": "Cookie,Accept-Encoding", "via": "1.1 ca2190123e61f1744d1210c24c87c840.cloudfront.net (CloudFront)", "x-amz-cf-id": "Pcs66MJ4VgieEF9HsQSWZoW_pwp0WbWCJp-7bycMChFeXYzxH8ZKBA==", "x-amz-cf-pop": "IAD12-P5", "x-cache": "Miss from cloudfront", "x-content-type-options": "nosniff", "x-frame-options": "SAMEORIGIN", "x-generator": "Drupal 10 (https://www.drupal.org)" }, "vulnerableLibrariesAuditScore": null, "vulnerableLibraries": [] }, "recommendations": [ { "title": "Add a Content-Security-Policy header", "urgency": "high", "detail": "Add an appropriate CSP to reduce script injection and resource loading risk." }, { "title": "Enable Strict-Transport-Security", "urgency": "medium", "detail": "Set a Strict-Transport-Security header to enforce HTTPS on repeat visits." }, { "title": "Define a Referrer-Policy", "urgency": "low", "detail": "Set a referrer policy to reduce unnecessary URL data leakage." }, { "title": "Define a Permissions-Policy", "urgency": "low", "detail": "Restrict browser capabilities to only what the application needs." }, { "title": "Add SRI to external scripts", "urgency": "medium", "detail": "10 external script tag(s) are missing integrity attributes." } ] }, "expectedFiles": { "score": 25, "urgency": "low", "origin": "https://www.barcelona.cat", "checks": [ { "path": "/robots.txt", "kind": "expected", "url": "https://www.barcelona.cat/robots.txt", "found": true, "status": 200, "contentType": "text/plain" }, { "path": "/sitemap.xml", "kind": "beneficial", "url": "https://www.barcelona.cat/sitemap.xml", "found": true, "status": 200, "contentType": "application/xml; charset=utf-8" }, { "path": "/.well-known/security.txt", "kind": "beneficial", "url": "https://www.barcelona.cat/.well-known/security.txt", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/manifest.webmanifest", "kind": "beneficial", "url": "https://www.barcelona.cat/manifest.webmanifest", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/favicon.ico", "kind": "beneficial", "url": "https://www.barcelona.cat/favicon.ico", "found": true, "status": 200, "contentType": "image/x-icon" } ], "recommendations": [ { "title": "Add beneficial discoverability and maintenance files", "urgency": "low", "detail": "Missing beneficial file(s): /.well-known/security.txt, /manifest.webmanifest." } ] }, "mediaHints": { "score": 20, "urgency": "low", "checks": { "hasDarkMode": false, "hasMetaColorScheme": false, "hasDarkModeQuery": false, "autoplayingMedia": [], "autoplayCount": 0, "unmutedAutoplayCount": 0, "totalImages": 52, "imagesWithLazy": 28, "imagesWithoutLazy": 24 }, "recommendations": [ { "title": "Add dark mode support", "urgency": "medium", "detail": "No prefers-color-scheme: dark media query or color-scheme meta tag was found. 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Global lazy loading reduces initial data transfer and energy consumption.", "wsid": "11.lazy loading", "assessor": "script", "example": "\"Description\"\n\n" }, { "guideline": "2.4", "title": "Review User Journey Efficiency", "urgency": "investigate", "detail": "Have a human walk through the main user journeys and verify they require the fewest steps possible. Unnecessary steps waste user time and device energy. Look for redundant confirmations, forced account creation, and non-essential interstitials.", "wsid": "2.minimize non-essential content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#minimize-non-essential-content-interactivity-or-journeys", "assessor": "human" }, { "guideline": "2.6", "title": "Check for Engagement Traps", "urgency": "investigate", "detail": "Manually review the page for patterns that artificially prolong engagement: infinite scroll, autoplay carousels, sticky overlays, and notification permission prompts. These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human" }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human" }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. 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Estimated savings: 3.07 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.90 MB." }, { "title": "Minify JavaScript before transfer", "urgency": "high", "detail": "Minify JS bundles so transport compression produces better results with fewer bytes. Estimated savings: 85.20 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "low", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 4.83 KB." }, { "title": "Minify CSS before transfer", "urgency": "low", "detail": "Minification amplifies compression efficiency and reduces payload size. Estimated savings: 3.58 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 7837244.35, "totalEstimatedBlockingMs": 1751, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 3221603.35, "estimatedBlockingMs": 0, "displayValue": "Est savings of 3,146 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 1994316, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,948 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 1845757, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,802 KiB", "urgency": "high", "sourceAuditId": "unused-javascript" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 327657, "estimatedBlockingMs": 0, "displayValue": "Est savings of 320 KiB", "urgency": "high", "sourceAuditId": "unused-css-rules" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 269996, "estimatedBlockingMs": 0, "displayValue": "Est savings of 264 KiB", "urgency": "high", "sourceAuditId": "offscreen-images" }, { "id": "unminified-javascript", "title": "Minify JavaScript", "detail": "Use minified production JS output to reduce payload size.", "estimatedSavingsBytes": 87247, "estimatedBlockingMs": 0, "displayValue": "Est savings of 85 KiB", "urgency": "high", "sourceAuditId": "unminified-javascript" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1751, "displayValue": "Est savings of 1,750 ms", "urgency": "high", "sourceAuditId": "render-blocking-resources" }, { "id": "uses-responsive-images", "title": "Right-size images for viewport", "detail": "Avoid sending larger images than the rendered size needs.", "estimatedSavingsBytes": 82054, "estimatedBlockingMs": 0, "displayValue": "Est savings of 80 KiB", "urgency": "medium", "sourceAuditId": "uses-responsive-images" }, { "id": "uses-text-compression", "title": "Enable text compression", "detail": "Serve text assets with Brotli or gzip to remove avoidable transfer bloat.", "estimatedSavingsBytes": 4945, "estimatedBlockingMs": 0, "displayValue": "Est savings of 5 KiB", "urgency": "low", "sourceAuditId": "uses-text-compression" }, { "id": "unminified-css", "title": "Minify CSS", "detail": "Use minified production CSS output to reduce bytes in transit.", "estimatedSavingsBytes": 3669, "estimatedBlockingMs": 0, "displayValue": "Est savings of 4 KiB", "urgency": "low", "sourceAuditId": "unminified-css" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 3.07 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.90 MB." }, { "title": "Remove unused JavaScript", "urgency": "high", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 1.76 MB." }, { "title": "Remove unused CSS", "urgency": "high", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 319.98 KB." }, { "title": "Lazy-load offscreen images", "urgency": "high", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 263.67 KB." }, { "title": "Minify JavaScript", "urgency": "high", "detail": "Use minified production JS output to reduce payload size. Estimated byte savings: 85.20 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 10, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "10 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 3087981.2271764437 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 2.94 MB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 2.94 MB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. 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"id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 23, "urgency": "high", "transferBytes": 9133170, "estimatedDeferrableBytes": 2443410, "renderBlockingMs": 1751, "breakdown": { "offscreenImageSavings": 269996, "unusedJavascriptSavings": 1845757, "unusedCssSavings": 327657 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "high", "estimatedSavingsBytes": 269996, 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{ "title": "Evaluate deferred loading for heavy script from mobile.com-shi-va.barcelona.cat", "area": "script", "urgency": "high", "estimatedSavingsBytes": 715602, "url": "https://mobile.com-shi-va.barcelona.cat/assets/index-CiPq0rWH.js", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy script from com-shi-va.barcelona.cat", "area": "script", "urgency": "high", "estimatedSavingsBytes": 546220, "url": "https://com-shi-va.barcelona.cat/assets/index-97beb0ec.js", "strategy": "Confirm this asset is required for first 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"dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 3, "transferBytes": 807, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=7pvCms&url=https%3A%2F%2Fwww.barcelona.cat%2Fen", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 14 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "9 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 48, "urgency": "high", "transferBytes": 9133170, "estimatedRedundantBytes": 2173414, "redundancyRatio": 0.23796929215157497, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 1845757, "displayValue": "Est savings of 1,802 KiB" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 327657, "displayValue": "Est savings of 320 KiB" } ], "recommendations": [ { "title": "Reduce unused javascript", "urgency": "high", "estimatedSavingsBytes": 1845757, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused css", "urgency": "high", "estimatedSavingsBytes": 327657, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Enable and verify text compression", "urgency": "medium", "estimatedSavingsBytes": 4945, "auditId": "uses-text-compression", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 46, "urgency": "high", "totalTransferBytes": 9133170, "heavyRequestCount": 25, "heavyBytes": 7073270, "heavyRatio": 0.7744594702605996, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/platja_1920x540_1.jpg", "transferSize": 1071446, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://api.com-shi-va.barcelona.cat/other_bus/lines/?RECORRIDO=0&access_token=1UWeUzjkmvYh93M14bl7JvnNwVkJSK", "transferSize": 727743, "resourceType": "xhr", "mimeType": "application/json", "domain": "api.com-shi-va.barcelona.cat" }, { "url": "https://mobile.com-shi-va.barcelona.cat/assets/index-CiPq0rWH.js", "transferSize": 715602, "resourceType": "script", "mimeType": "text/javascript", "domain": "mobile.com-shi-va.barcelona.cat" }, { "url": "https://com-shi-va.barcelona.cat/assets/index-97beb0ec.js", "transferSize": 546220, "resourceType": "script", "mimeType": "text/javascript", "domain": "com-shi-va.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/gentgranmontserratolivella_1900x547_2.jpg", "transferSize": 498993, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/vistes_aeries_bcn_5_1900x547_1.jpg", "transferSize": 427875, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://api.com-shi-va.barcelona.cat/bus/lines/?RECORRIDO=0&access_token=1UWeUzjkmvYh93M14bl7JvnNwVkJSK", "transferSize": 276862, "resourceType": "xhr", "mimeType": "application/json", "domain": "api.com-shi-va.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/una-nena-en-banyador-es-refresca-a-la%20%281%29_1.jpg", "transferSize": 256049, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/estatics/geobcn/1.2/api-full-ca.js", "transferSize": 247011, "resourceType": "script", "mimeType": "text/javascript", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/estatics/geobcn/1.2/js/lib/openlayers/ol-6.15.1.js", "transferSize": 243723, "resourceType": "script", "mimeType": "text/javascript", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/cap_mobile/public/vistes_aeries_bcn_5_1900x547_1.jpg?itok=3Z4-xTNJ", "transferSize": 227508, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://mobile.com-shi-va.barcelona.cat/assets/index-DFDXDFpa.css", "transferSize": 220914, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "mobile.com-shi-va.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/cap_mobile/public/platja_1024x400_1.jpg?itok=AOPri9KF", "transferSize": 209925, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/cap_mobile/public/una-nena-en-banyador-es-refresca-a-la%20%281%29_1.jpg?itok=3kOKyCSO", "transferSize": 202172, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://maps.googleapis.com/maps/api/js?key=AIzaSyA1hYiZ1NN9YNkxQPWfVHYhI7hmS1JLlLI&libraries=places%2Cgeometry&language=en&v=3.47&callback=vueGoogleMapsInit", "transferSize": 185237, "resourceType": "script", "mimeType": "text/javascript", "domain": "maps.googleapis.com" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/cap_mobile/public/gentgranmontserratolivella_1900x547_2.jpg?itok=BMl3PxBR", "transferSize": 175516, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/Banner_Municipals_252x252_ENG%20%282%29.png", "transferSize": 158206, "resourceType": "image", "mimeType": "image/png", "domain": "www.barcelona.cat" }, { "url": "https://releases.jquery.com/git/ui/jquery-ui-git.js", "transferSize": 126610, "resourceType": "script", "mimeType": "application/javascript", "domain": "releases.jquery.com" }, { "url": "https://www.barcelona.cat/sites/default/files/ICUB_WebBarcelona_252x252px_0.png", "transferSize": 110510, "resourceType": "image", "mimeType": "image/png", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/estatics-planol/v1.2/library/jquery-ui-1.10.4.js", "transferSize": 109118, "resourceType": "script", "mimeType": "text/javascript", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "image", "count": 10, "transferBytes": 3338200 }, { "resourceType": "script", "count": 8, "transferBytes": 2249947 }, { "resourceType": "xhr", "count": 2, "transferBytes": 1004605 }, { "resourceType": "stylesheet", "count": 3, "transferBytes": 335036 }, { "resourceType": "font", "count": 2, "transferBytes": 145482 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 16, "transferBytes": 4135477 }, { "domain": "api.com-shi-va.barcelona.cat", "count": 2, "transferBytes": 1004605 }, { "domain": "mobile.com-shi-va.barcelona.cat", "count": 2, "transferBytes": 936516 }, { "domain": "com-shi-va.barcelona.cat", "count": 2, "transferBytes": 608399 }, { "domain": "maps.googleapis.com", "count": 1, "transferBytes": 185237 }, { "domain": "releases.jquery.com", "count": 1, "transferBytes": 126610 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76426 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "high", "estimatedSavingsBytes": 269996, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "high", "estimatedSavingsBytes": 1845757, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 1071446, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/platja_1920x540_1.jpg", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy xhr asset from api.com-shi-va.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 727743, "strategy": "Move this asset behind an explicit interaction, route boundary, or lazy-loading trigger.", "url": "https://api.com-shi-va.barcelona.cat/other_bus/lines/?RECORRIDO=0&access_token=1UWeUzjkmvYh93M14bl7JvnNwVkJSK", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from mobile.com-shi-va.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 715602, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://mobile.com-shi-va.barcelona.cat/assets/index-CiPq0rWH.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0, "displayValue": "19.4 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 19.4 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.22, "displayValue": "7.9 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 7.9 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 1,802 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 1,802 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 320 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 320 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 3,146 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 3,146 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 1,948 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 1,948 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 264 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 264 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,750 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,750 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "server-response-time", "title": "Reduce initial server response time", "description": "Keep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).", "score": 0, "displayValue": "Root document took 710 ms", "impact": "high", "wsg": { "categoryId": "4", "categoryName": "Hosting, Infrastructure, and Systems", "id": "11", "title": "Ensure infrastructure fits project requirements", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements", "subheading": "Maintain the infrastructure you require rather than over-provisioning. Autoscale to meet demand and preserve hardware resources." }, "assessor": "script", "issueTemplate": "## Improve Reduce initial server response time\n\n- Lighthouse audit: server-response-time\n- Current value: Root document took 710 ms\n- WSG guideline: 11 Ensure infrastructure fits project requirements\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements\n\n### Why this matters\nKeep the server response time for the main document short because all other requests depend on it. 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this page include this issue." } ] }, "metadata": { "score": 0, "urgency": "low", "checks": { "hasTitle": true, "hasLang": true, "hasDescription": true, "hasCanonical": true, "hasOpenGraphCore": true, "hasTwitterCard": true, "hasViewport": true, "hasCharset": true, "hasValidStructuredData": true, "hasInvalidStructuredData": false }, "observed": { "title": "El portal web oficial de Barcelona | Ayuntamiento de Barcelona", "lang": "es", "charset": "utf-8", "viewport": "width=device-width, initial-scale=1, shrink-to-fit=no", "description": "Portal oficial de Barcelona. Accede a los trámites de la Administración, actualidad de servicios municipales, movilidad, agenda cultural y recursos para vivir y trabajar en la ciudad.", "robots": "", "canonical": "https://www.barcelona.cat/es", "ogTitle": "Barcelona.cat", "ogDescription": "Conecta con Barcelona. Encuentra toda la información práctica para el día a día: desde trámites y servicios públicos hasta la agenda de cultura y ocio.", "ogType": "Web", "ogUrl": "https://www.barcelona.cat/es/home", "twitterCard": "summary_large_image", "ldJsonCount": 0, "validLdJsonCount": 0, "invalidLdJsonCount": 0 }, "recommendations": [ { "title": "Metadata structure looks healthy", "urgency": "low", "detail": "Core machine-readable metadata is present and no structural issues were detected." } ] }, "layoutAdaptation": { "score": 42, "urgency": "medium", "checks": { "testedMobile": true, "testedTablet": true, "horizontalOverflowOnMobile": false, "horizontalOverflowOnTablet": false, "mobileSmallTapTargets": 65, "tabletSmallTapTargets": 58, "fixedWidthOffenders": 6, "oversizedMedia": 0, "scanErrors": 0 }, "perDevice": [ { "device": "mobile", "viewportWidth": 390, "viewportHeight": 844, "contentWidth": 390, "horizontalOverflowPx": 0, "hasHorizontalOverflow": false, "fixedWidthOffenders": 3, "smallTapTargets": 65, "oversizedMedia": 0 }, { "device": "tablet", "viewportWidth": 820, "viewportHeight": 1180, "contentWidth": 820, "horizontalOverflowPx": 0, "hasHorizontalOverflow": false, "fixedWidthOffenders": 3, "smallTapTargets": 58, "oversizedMedia": 0 } ], "recommendations": [ { "title": "Increase touch target sizes", "urgency": "high", "detail": "Ensure interactive controls are at least 44x44 CSS px. Detected 65 small targets on mobile and 58 on tablet." }, { "title": "Refactor fixed-width components", "urgency": "medium", "detail": "6 element(s) exceeded viewport width in tested layouts; use responsive component constraints." } ] }, "securityLight": { "score": 59, "urgency": "medium", "checks": { "isHttps": true, "hasHsts": false, "hasCsp": false, "hasXContentTypeOptions": true, "hasReferrerPolicy": false, "hasPermissionsPolicy": false, "exposesServerFingerprint": true, "externalScriptCount": 10, "externalScriptsWithoutIntegrity": 10, "vulnerableLibraryCount": 0 }, "observed": { "headers": { "cache-control": "max-age=300, public", "content-encoding": "gzip", "content-language": "es", "content-length": "17949", "content-type": "text/html; charset=UTF-8", "date": "Mon, 13 Apr 2026 22:40:00 GMT", "etag": "\"1776120000-gzip\"", "expires": "Sun, 19 Nov 1978 05:00:00 GMT", "last-modified": "Mon, 13 Apr 2026 22:40:00 GMT", "server": "nginx", "vary": "Cookie,Accept-Encoding", "via": "1.1 ca2190123e61f1744d1210c24c87c840.cloudfront.net (CloudFront)", "x-amz-cf-id": "7-uTpZoujHLdf2YECzw_sO6ZCWJXAbTMuRNBiTtwNzlvLD5CsU3WGg==", "x-amz-cf-pop": "IAD12-P5", "x-cache": "Miss from cloudfront", "x-content-type-options": "nosniff", "x-frame-options": "SAMEORIGIN", "x-generator": "Drupal 10 (https://www.drupal.org)" }, "vulnerableLibrariesAuditScore": null, "vulnerableLibraries": [] }, "recommendations": [ { "title": "Add a Content-Security-Policy header", "urgency": "high", "detail": "Add an appropriate CSP to reduce script injection and resource loading risk." }, { "title": "Enable Strict-Transport-Security", "urgency": "medium", "detail": "Set a Strict-Transport-Security header to enforce HTTPS on repeat visits." }, { "title": "Define a Referrer-Policy", "urgency": "low", "detail": "Set a referrer policy to reduce unnecessary URL data leakage." }, { "title": "Define a Permissions-Policy", "urgency": "low", "detail": "Restrict browser capabilities to only what the application needs." }, { "title": "Add SRI to external scripts", "urgency": "medium", "detail": "10 external script tag(s) are missing integrity attributes." } ] }, "expectedFiles": { "score": 25, "urgency": "low", "origin": "https://www.barcelona.cat", "checks": [ { "path": "/robots.txt", "kind": "expected", "url": "https://www.barcelona.cat/robots.txt", "found": true, "status": 200, "contentType": "text/plain" }, { "path": "/sitemap.xml", "kind": "beneficial", "url": "https://www.barcelona.cat/sitemap.xml", "found": true, "status": 200, "contentType": "application/xml; charset=utf-8" }, { "path": "/.well-known/security.txt", "kind": "beneficial", "url": "https://www.barcelona.cat/.well-known/security.txt", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/manifest.webmanifest", "kind": "beneficial", "url": "https://www.barcelona.cat/manifest.webmanifest", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/favicon.ico", "kind": "beneficial", "url": "https://www.barcelona.cat/favicon.ico", "found": true, "status": 200, "contentType": "image/x-icon" } ], "recommendations": [ { "title": "Add beneficial discoverability and maintenance files", "urgency": "low", "detail": "Missing beneficial file(s): /.well-known/security.txt, /manifest.webmanifest." } ] }, "mediaHints": { "score": 20, "urgency": "low", "checks": { "hasDarkMode": false, "hasMetaColorScheme": false, "hasDarkModeQuery": false, "autoplayingMedia": [], "autoplayCount": 0, "unmutedAutoplayCount": 0, "totalImages": 52, "imagesWithLazy": 28, "imagesWithoutLazy": 24 }, "recommendations": [ { "title": "Add dark mode support", "urgency": "medium", "detail": "No prefers-color-scheme: dark media query or color-scheme meta tag was found. Dark mode reduces energy use on OLED screens and improves user choice." } ] }, "wsgCustom": { "score": 85, "urgency": "medium", "data": { "hasPrintStyles": true, "hasReducedMotion": true, "media": { "totalImages": 56, "lazyImages": 29, "totalIframes": 5, "lazyIframes": 0 }, "typography": { "primaryFont": "\"Source Sans Pro\", \"Helvetica Neue\", Helvetica, Arial, sans-serif", "usesSystemFont": true }, "tracking": { "count": 0, "scripts": [] }, "semantics": { "hasNavigation": true, "hasMainContent": true } }, "recommendations": [ { "guideline": "11.3", "title": "Incomplete media lazy loading", "urgency": "medium", "detail": "Only 29/56 images use loading=\"lazy\". Global lazy loading reduces initial data transfer and energy consumption.", "wsid": "11.lazy loading", "assessor": "script", "example": "\"Description\"\n\n" }, { "guideline": "2.4", "title": "Review User Journey Efficiency", "urgency": "investigate", "detail": "Have a human walk through the main user journeys and verify they require the fewest steps possible. Unnecessary steps waste user time and device energy. Look for redundant confirmations, forced account creation, and non-essential interstitials.", "wsid": "2.minimize non-essential content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#minimize-non-essential-content-interactivity-or-journeys", "assessor": "human" }, { "guideline": "2.6", "title": "Check for Engagement Traps", "urgency": "investigate", "detail": "Manually review the page for patterns that artificially prolong engagement: infinite scroll, autoplay carousels, sticky overlays, and notification permission prompts. These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human" }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human" }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 57, "urgency": "medium", "totalEstimatedSavingsBytes": 5315304.050000001, "checks": { "hasEffectiveTextCompression": false }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 3223822.0500000003, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "estimatedSavingsBytes": 1995598, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." }, { "id": "unminified-javascript", "title": "Minify JavaScript before transfer", "urgency": "high", "estimatedSavingsBytes": 87243, "detail": "Minify JS bundles so transport compression produces better results with fewer bytes." }, { "id": "uses-text-compression", "title": "Enable Brotli/gzip for text assets", "urgency": "low", "estimatedSavingsBytes": 4975, "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip." }, { "id": "unminified-css", "title": "Minify CSS before transfer", "urgency": "low", "estimatedSavingsBytes": 3666, "detail": "Minification amplifies compression efficiency and reduces payload size." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 3.07 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.90 MB." }, { "title": "Minify JavaScript before transfer", "urgency": "high", "detail": "Minify JS bundles so transport compression produces better results with fewer bytes. Estimated savings: 85.20 KB." }, { "title": "Enable Brotli/gzip for text assets", "urgency": "low", "detail": "Compress HTML, CSS, JS, JSON, SVG, and XML responses with Brotli or gzip. Estimated savings: 4.86 KB." }, { "title": "Minify CSS before transfer", "urgency": "low", "detail": "Minification amplifies compression efficiency and reduces payload size. Estimated savings: 3.58 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 7829936.050000001, "totalEstimatedBlockingMs": 1903, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 3223822.0500000003, "estimatedBlockingMs": 0, "displayValue": "Est savings of 3,148 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 1995598, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,949 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 1834354, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,791 KiB", "urgency": "high", "sourceAuditId": "unused-javascript" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 327623, "estimatedBlockingMs": 0, "displayValue": "Est savings of 320 KiB", "urgency": "high", "sourceAuditId": "unused-css-rules" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 270601, "estimatedBlockingMs": 0, "displayValue": "Est savings of 264 KiB", "urgency": "high", "sourceAuditId": "offscreen-images" }, { "id": "unminified-javascript", "title": "Minify JavaScript", "detail": "Use minified production JS output to reduce payload size.", "estimatedSavingsBytes": 87243, "estimatedBlockingMs": 0, "displayValue": "Est savings of 85 KiB", "urgency": "high", "sourceAuditId": "unminified-javascript" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1903, "displayValue": "Est savings of 1,900 ms", "urgency": "high", "sourceAuditId": "render-blocking-resources" }, { "id": "uses-responsive-images", "title": "Right-size images for viewport", "detail": "Avoid sending larger images than the rendered size needs.", "estimatedSavingsBytes": 82054, "estimatedBlockingMs": 0, "displayValue": "Est savings of 80 KiB", "urgency": "medium", "sourceAuditId": "uses-responsive-images" }, { "id": "uses-text-compression", "title": "Enable text compression", "detail": "Serve text assets with Brotli or gzip to remove avoidable transfer bloat.", "estimatedSavingsBytes": 4975, "estimatedBlockingMs": 0, "displayValue": "Est savings of 5 KiB", "urgency": "low", "sourceAuditId": "uses-text-compression" }, { "id": "unminified-css", "title": "Minify CSS", "detail": "Use minified production CSS output to reduce bytes in transit.", "estimatedSavingsBytes": 3666, "estimatedBlockingMs": 0, "displayValue": "Est savings of 4 KiB", "urgency": "low", "sourceAuditId": "unminified-css" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 3.07 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.90 MB." }, { "title": "Remove unused JavaScript", "urgency": "high", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 1.75 MB." }, { "title": "Remove unused CSS", "urgency": "high", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 319.94 KB." }, { "title": "Lazy-load offscreen images", "urgency": "high", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 264.26 KB." }, { "title": "Minify JavaScript", "urgency": "high", "detail": "Use minified production JS output to reduce payload size. Estimated byte savings: 85.20 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 10, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "10 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 3092854.7214851025 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 2.95 MB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 2.95 MB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 15, "urgency": "high", "transferBytes": 9276348, "css": { "unusedBytes": 327623, "ratio": 0.03531810147700366, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 1834354, "duplicatedBytes": 0, "ratio": 0.19774527648164988, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.25, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 327623, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "high", "estimatedSavingsBytes": 1834354, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 23, "urgency": "high", "transferBytes": 9276348, "estimatedDeferrableBytes": 2432578, "renderBlockingMs": 1903, "breakdown": { "offscreenImageSavings": 270601, "unusedJavascriptSavings": 1834354, "unusedCssSavings": 327623 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "high", "estimatedSavingsBytes": 270601, 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prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "high", "estimatedSavingsBytes": 327623, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1903, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": 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"image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/Banner_Municipals_252x252_CAST%20%281%29.png", "transferSize": 156769, "resourceType": "image", "mimeType": "image/png", "domain": "www.barcelona.cat" }, { "url": "https://releases.jquery.com/git/ui/jquery-ui-git.js", "transferSize": 126611, "resourceType": "script", "mimeType": "application/javascript", "domain": "releases.jquery.com" }, { "url": "https://www.barcelona.cat/sites/default/files/ICUB_WebBarcelona_252x252px_0.png", "transferSize": 110502, "resourceType": "image", "mimeType": "image/png", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/estatics-planol/v1.2/library/jquery-ui-1.10.4.js", "transferSize": 109109, "resourceType": "script", "mimeType": "text/javascript", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "image", "count": 10, "transferBytes": 3336770 }, { "resourceType": "script", "count": 8, "transferBytes": 2250704 }, { "resourceType": "xhr", "count": 2, "transferBytes": 1008701 }, { "resourceType": "stylesheet", "count": 3, "transferBytes": 335013 }, { "resourceType": "font", "count": 2, "transferBytes": 145481 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 16, "transferBytes": 4134021 }, { "domain": "api.com-shi-va.barcelona.cat", "count": 2, "transferBytes": 1008701 }, { "domain": "mobile.com-shi-va.barcelona.cat", "count": 2, "transferBytes": 936489 }, { "domain": "com-shi-va.barcelona.cat", "count": 2, "transferBytes": 608395 }, { "domain": "maps.googleapis.com", "count": 1, "transferBytes": 186027 }, { "domain": "releases.jquery.com", "count": 1, "transferBytes": 126611 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "high", "estimatedSavingsBytes": 270601, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "high", "estimatedSavingsBytes": 1834354, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 1071465, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/platja_1920x540_0.jpg", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy xhr asset from api.com-shi-va.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 730177, "strategy": "Move this asset behind an explicit interaction, route boundary, or lazy-loading trigger.", "url": "https://api.com-shi-va.barcelona.cat/other_bus/lines/?RECORRIDO=0&access_token=1UWeUzjkmvYh93M14bl7JvnNwVkJSK", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from mobile.com-shi-va.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 715593, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://mobile.com-shi-va.barcelona.cat/assets/index-CiPq0rWH.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0, "displayValue": "19.5 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 19.5 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.19, "displayValue": "8.4 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 8.4 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 1,791 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 1,791 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 320 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 320 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 3,148 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 3,148 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 1,949 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 1,949 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 264 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 264 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,900 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,900 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0, "displayValue": "1,616 elements", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,616 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-text-compression", "title": "Enable text compression", "description": "Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes. [Learn more about text compression](https://developer.chrome.com/docs/lighthouse/performance/uses-text-compression/).", "score": 0.5, "displayValue": "Est savings of 5 KiB", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Enable text compression\n\n- Lighthouse audit: uses-text-compression\n- Current value: Est savings of 5 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nText-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes. [Learn more about text compression](https://developer.chrome.com/docs/lighthouse/performance/uses-text-compression/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "total-byte-weight", "title": "Avoid enormous network payloads", "description": "Large network payloads cost users real money and are highly correlated with long load times. [Learn how to reduce payload sizes](https://developer.chrome.com/docs/lighthouse/performance/total-byte-weight/).", "score": 0.5, "displayValue": "Total size was 9,059 KiB", "impact": "medium", "wsg": { "categoryId": "5", "categoryName": "Business Strategy And Product Management", "id": "25", "title": "Define performance and environmental budgets", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#define-performance-and-environmental-budgets", "subheading": "Set budgets, taking people, planet, and performance into account alongside baselines, targets, evidence, and resources to help meet KPIs." }, "assessor": "script", "issueTemplate": "## Improve Avoid enormous network payloads\n\n- Lighthouse audit: total-byte-weight\n- Current value: Total size was 9,059 KiB\n- WSG guideline: 25 Define performance and environmental budgets\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#define-performance-and-environmental-budgets\n\n### Why this matters\nLarge network payloads cost users real money and are highly correlated with long load times. [Learn how to reduce payload sizes](https://developer.chrome.com/docs/lighthouse/performance/total-byte-weight/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/ca/canelons", "status": "ok", "finalUrl": "https://www.barcelona.cat/ca/canelons", "performanceScore": 0.45, "bestPracticesScore": 1, "transferBytes": 1025838, "co2Grams": 0.39297945721320005, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76424, 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Estimated savings: 247.26 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 775501.95, "totalEstimatedBlockingMs": 878, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 296257.95, "estimatedBlockingMs": 0, "displayValue": "Est savings of 289 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 253193, "estimatedBlockingMs": 0, "displayValue": "Est savings of 247 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 83661, "estimatedBlockingMs": 0, "displayValue": "Est savings of 82 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 81612, "estimatedBlockingMs": 0, "displayValue": "Est savings of 80 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 878, "displayValue": "Est savings of 880 ms", "urgency": "medium", "sourceAuditId": "render-blocking-resources" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 32481, "estimatedBlockingMs": 0, "displayValue": "Est savings of 32 KiB", "urgency": "low", "sourceAuditId": "unused-javascript" }, { "id": "uses-responsive-images", "title": "Right-size images for viewport", "detail": "Avoid sending larger images than the rendered size needs.", "estimatedSavingsBytes": 28297, "estimatedBlockingMs": 0, "displayValue": "Est savings of 28 KiB", "urgency": "low", "sourceAuditId": "uses-responsive-images" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 289.31 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 247.26 KB." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 81.70 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 79.70 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "medium", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 878 ms." }, { "title": "Remove unused JavaScript", "urgency": "low", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 31.72 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 168000.4337639665 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 7, "urgency": "medium", "transferBytes": 1025838, "css": { "unusedBytes": 81612, "ratio": 0.0795564211893106, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 32481, "duplicatedBytes": 0, "ratio": 0.03166289414118019, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 81612, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 14, "urgency": "medium", "transferBytes": 1025838, "estimatedDeferrableBytes": 197754, "renderBlockingMs": 878, "breakdown": { "offscreenImageSavings": 83661, "unusedJavascriptSavings": 32481, "unusedCssSavings": 81612 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "medium", "estimatedSavingsBytes": 81612, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "medium", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 878, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "high", "estimatedSavingsBytes": 250878, "url": "https://www.barcelona.cat/sites/default/files/styles/galeria_medium/public/101216_canelons_710x379.jpg?itok=haBG-9BO", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90560, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy script from cdn.matomo.cloud", "area": "script", "urgency": "medium", "estimatedSavingsBytes": 76424, "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139463, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76424, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15572, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7145, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=KUM3rY&url=https%3A%2F%2Fwww.barcelona.cat%2Fca%2Fcanelons", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 16, "urgency": "low", "transferBytes": 1025838, "estimatedRedundantBytes": 114093, "redundancyRatio": 0.11121931533049077, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 81612, "displayValue": "Est savings of 80 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 32481, "displayValue": "Est savings of 32 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 81612, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored 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to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 28, "urgency": "medium", "totalTransferBytes": 1025838, "heavyRequestCount": 5, "heavyBytes": 521880, "heavyRatio": 0.508735297386137, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/styles/galeria_medium/public/101216_canelons_710x379.jpg?itok=haBG-9BO", "transferSize": 250878, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90560, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76424, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54921, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_evpTRQTawGYS1Ro7RbXq3hBxwat7AU-RJm1V8ZgzeaE.css?delta=5&language=ca&theme=barcelonacat_theme&include=eJyFzsGKwzAMBNAfiuvDfpAZOyJxcSQjydn272sodFnIsieJmXcY3Ac7DmJPOKuJxfcJ6HXJ0EJNGAWe5CTVupLFqUdwkTb7v0zHRuGs9P0b-E4HxSzi5oqeyspXYGuS0YL5s1XerkQtEvDZfiVMxsySgS19_Qe6ypILp8kU8fMlejgpoy0dim0u3i2uOjra7Se5De4jt2o7rYs9zemIGUYvwgyJSg&tcut5n", "transferSize": 49097, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "image", "count": 1, "transferBytes": 250878 }, { "resourceType": "font", "count": 2, "transferBytes": 145481 }, { "resourceType": "script", "count": 1, "transferBytes": 76424 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 49097 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 4, "transferBytes": 445456 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76424 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "medium", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 250878, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/galeria_medium/public/101216_canelons_710x379.jpg?itok=haBG-9BO", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90560, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76424, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.04, "displayValue": "7.6 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 7.6 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 32 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 32 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 80 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 80 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 289 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 289 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 247 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 247 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 82 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 82 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 880 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 880 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "server-response-time", "title": "Reduce initial server response time", "description": "Keep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).", "score": 0, "displayValue": "Root document took 620 ms", "impact": "high", "wsg": { "categoryId": "4", "categoryName": "Hosting, Infrastructure, and Systems", "id": "11", "title": "Ensure infrastructure fits project requirements", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements", "subheading": "Maintain the infrastructure you require rather than over-provisioning. Autoscale to meet demand and preserve hardware resources." }, "assessor": "script", "issueTemplate": "## Improve Reduce initial server response time\n\n- Lighthouse audit: server-response-time\n- Current value: Root document took 620 ms\n- WSG guideline: 11 Ensure infrastructure fits project requirements\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements\n\n### Why this matters\nKeep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.8, "displayValue": "4.1 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 4.1 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "992 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 992 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/ca/coneixbcn", "status": "ok", "finalUrl": "https://www.barcelona.cat/ca/coneixbcn", "performanceScore": 0.66, "bestPracticesScore": 1, "transferBytes": 1960330, "co2Grams": 0.7509659608620002, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "stylesheet", "requestCount": 1, "transferBytes": 24654, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", 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Estimated byte savings: 1013.03 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 832.52 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1664 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 81.70 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 81.69 KB." }, { "title": "Remove unused JavaScript", "urgency": "medium", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 52.75 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 168009.9584846369 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.07 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.07 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 5, "urgency": "medium", "transferBytes": 1960330, "css": { "unusedBytes": 83649, "ratio": 0.04267087684216433, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 54018, "duplicatedBytes": 0, "ratio": 0.027555564624323455, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 83649, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 54018, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 18, "urgency": "high", "transferBytes": 1960330, "estimatedDeferrableBytes": 221328, "renderBlockingMs": 1664, "breakdown": { "offscreenImageSavings": 83661, "unusedJavascriptSavings": 54018, "unusedCssSavings": 83649 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 54018, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "high", "estimatedSavingsBytes": 83649, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1664, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "high", "estimatedSavingsBytes": 261413, "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_gran/public/destacat-cultura%20popular4071.jpg?itok=cA32eUx7", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139457, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, "sampleUrl": 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"listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7145, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=sGJbeq&url=https%3A%2F%2Fwww.barcelona.cat%2Fca%2Fconeixbcn", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 14, "urgency": "medium", "transferBytes": 1960330, "estimatedRedundantBytes": 137667, "redundancyRatio": 0.07022644146648778, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 83649, "displayValue": "Est savings of 82 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 54018, "displayValue": "Est savings of 53 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 83649, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 54018, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 33, "urgency": "high", "totalTransferBytes": 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"https://www.barcelona.cat/sites/default/files/css/css_qDD4BCxE8K-iT7MRORwp32v03DlJblP9-xrYwOBWlQo.css?delta=5&language=ca&theme=barcelonacat_theme&include=eJyFz0FqxTAMBNALxd-LHsiMHTVxcSQjyenP7Wso_FJI6Upi5m0GH4MdB7EnnNXE4vcJ6HXJ0EJNGAWe5CTVupLFqUdwkTb7v0zHRuGs9Pkb-E4HxSzi5oqeysp34B1crizPu25rktGC-dUqb3eiFgl47boTJmNmycCW3v4DXWXJhdNkivj6Ej2dlNGWDsU21-wWVx0d7fGTPAb3kVu1ndbFLnM6YobRF2idlFA&tcut5n", "transferSize": 51938, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "image", "count": 5, "transferBytes": 854350 }, { "resourceType": "font", "count": 2, "transferBytes": 145481 }, { "resourceType": "script", "count": 1, "transferBytes": 76425 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 51938 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 8, "transferBytes": 1051769 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "medium", "estimatedSavingsBytes": 54018, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 261413, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_gran/public/destacat-cultura%20popular4071.jpg?itok=cA32eUx7", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0, "displayValue": "10.0 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 10.0 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 53 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 53 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 82 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 82 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 1,013 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 1,013 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 833 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 833 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 82 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 82 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,660 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,660 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.84, "displayValue": "3.8 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.8 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "1,101 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,101 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/ca/diada-nacional-de-catalunya-2022", "status": "ok", "finalUrl": "https://www.barcelona.cat/ca/diada-nacional-de-catalunya-2022", "performanceScore": 0.64, "bestPracticesScore": 1, "transferBytes": 809952, "co2Grams": 0.31027754609280006, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", 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Estimated savings: 56.67 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 355080.75, "totalEstimatedBlockingMs": 874, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 99038.75, "estimatedBlockingMs": 0, "displayValue": "Est savings of 97 KiB", "urgency": "medium", "sourceAuditId": "modern-image-formats" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 83661, "estimatedBlockingMs": 0, "displayValue": "Est savings of 82 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 81868, "estimatedBlockingMs": 0, "displayValue": "Est savings of 80 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 58032, "estimatedBlockingMs": 0, "displayValue": "Est savings of 57 KiB", "urgency": "medium", "sourceAuditId": "uses-optimized-images" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 874, "displayValue": "Est savings of 870 ms", "urgency": "medium", "sourceAuditId": "render-blocking-resources" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 32481, "estimatedBlockingMs": 0, "displayValue": "Est savings of 32 KiB", "urgency": "low", "sourceAuditId": "unused-javascript" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "medium", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 96.72 KB." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 81.70 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 79.95 KB." }, { "title": "Compress oversized image assets", "urgency": "medium", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 56.67 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "medium", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 874 ms." }, { "title": "Remove unused JavaScript", "urgency": "low", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. 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Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 8, "urgency": "medium", "transferBytes": 809952, "css": { "unusedBytes": 81868, "ratio": 0.10107759472166251, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 32481, "duplicatedBytes": 0, "ratio": 0.0401023764371222, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 81868, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 16, "urgency": "medium", "transferBytes": 809952, "estimatedDeferrableBytes": 198010, "renderBlockingMs": 874, "breakdown": { "offscreenImageSavings": 83661, "unusedJavascriptSavings": 32481, "unusedCssSavings": 81868 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "medium", "estimatedSavingsBytes": 81868, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "medium", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 874, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90562, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 84135, "url": "https://www.barcelona.cat/themes/barcelonacat_theme/images/menu/viula.jpg", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy script from cdn.matomo.cloud", "area": "script", "urgency": "medium", "estimatedSavingsBytes": 76426, "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "strategy": "Confirm this asset is required for first paint; 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"https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15565, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7146, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": 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"dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 18, "urgency": "low", "transferBytes": 809952, "estimatedRedundantBytes": 114349, "redundancyRatio": 0.14117997115878472, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 81868, "displayValue": "Est savings of 80 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 32481, "displayValue": "Est savings of 32 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 81868, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 20, "urgency": "medium", "totalTransferBytes": 809952, "heavyRequestCount": 4, "heavyBytes": 271013, "heavyRatio": 0.3346037789893722, "heavyRequests": [ { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90562, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76426, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54920, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_evpTRQTawGYS1Ro7RbXq3hBxwat7AU-RJm1V8ZgzeaE.css?delta=5&language=ca&theme=barcelonacat_theme&include=eJyFzkEKwzAMBMAPxfjQB5m1I1IXRzKSkja_r6EQKKT0pGV3DsJjY8dK7Al7NbH4OQG9ThlaqAmjwJPspFpnsjj0Flykjf2X6Vgo7JWe38DvtFLMIm6u6KnMfAWWJhktmB-t8nIlapGA8_crYbKNLhnY0u0f6CpTLpwGU8QzJXo5KaNNdpjTGjOM3gg5eRY&tcut5n", "transferSize": 49105, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "font", "count": 2, "transferBytes": 145482 }, { "resourceType": "script", "count": 1, "transferBytes": 76426 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 49105 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 3, "transferBytes": 194587 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76426 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "medium", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90562, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76426, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.03, "displayValue": "7.8 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 7.8 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 32 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 32 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 80 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 80 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 97 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 97 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 57 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 57 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 82 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 82 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 870 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 870 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "server-response-time", "title": "Reduce initial server response time", "description": "Keep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).", "score": 0, "displayValue": "Root document took 630 ms", "impact": "high", "wsg": { "categoryId": "4", "categoryName": "Hosting, Infrastructure, and Systems", "id": "11", "title": "Ensure infrastructure fits project requirements", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements", "subheading": "Maintain the infrastructure you require rather than over-provisioning. 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[Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.79, "displayValue": "4.1 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 4.1 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "936 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 936 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). 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Detected 47 small targets on mobile and 43 on tablet." } ] }, "securityLight": { "score": 59, "urgency": "medium", "checks": { "isHttps": true, "hasHsts": false, "hasCsp": false, "hasXContentTypeOptions": true, "hasReferrerPolicy": false, "hasPermissionsPolicy": false, "exposesServerFingerprint": true, "externalScriptCount": 7, "externalScriptsWithoutIntegrity": 7, "vulnerableLibraryCount": 0 }, "observed": { "headers": { "cache-control": "max-age=300, public", "content-encoding": "gzip", "content-language": "ca", "content-length": "17825", "content-type": "text/html; charset=UTF-8", "date": "Mon, 13 Apr 2026 22:41:13 GMT", "etag": "\"1776120073-gzip\"", "expires": "Sun, 19 Nov 1978 05:00:00 GMT", "last-modified": "Mon, 13 Apr 2026 22:41:13 GMT", "server": "nginx", "vary": "Cookie,Accept-Encoding", "via": "1.1 ca2190123e61f1744d1210c24c87c840.cloudfront.net (CloudFront)", "x-amz-cf-id": "wL9DGhAKgL94HSuchE_KNUUzyMpKWVCxAkerrDFPdg5dhaKVnwn3hw==", "x-amz-cf-pop": "IAD12-P5", "x-cache": "Miss from cloudfront", "x-content-type-options": "nosniff", "x-frame-options": "SAMEORIGIN", "x-generator": "Drupal 10 (https://www.drupal.org)" }, "vulnerableLibrariesAuditScore": null, "vulnerableLibraries": [] }, "recommendations": [ { "title": "Add a Content-Security-Policy header", "urgency": "high", "detail": "Add an appropriate CSP to reduce script injection and resource loading risk." }, { "title": "Enable Strict-Transport-Security", "urgency": "medium", "detail": "Set a Strict-Transport-Security header to enforce HTTPS on repeat visits." }, { "title": "Define a Referrer-Policy", "urgency": "low", "detail": "Set a referrer policy to reduce unnecessary URL data leakage." }, { "title": "Define a Permissions-Policy", "urgency": "low", "detail": "Restrict browser capabilities to only what the application needs." }, { "title": "Add SRI to external scripts", "urgency": "medium", "detail": "7 external script tag(s) are missing integrity attributes." } ] }, "expectedFiles": { "score": 25, "urgency": "low", "origin": "https://www.barcelona.cat", "checks": [ { "path": "/robots.txt", "kind": "expected", "url": "https://www.barcelona.cat/robots.txt", "found": true, "status": 200, "contentType": "text/plain" }, { "path": "/sitemap.xml", "kind": "beneficial", "url": "https://www.barcelona.cat/sitemap.xml", "found": true, "status": 200, "contentType": "application/xml; charset=utf-8" }, { "path": "/.well-known/security.txt", "kind": "beneficial", "url": "https://www.barcelona.cat/.well-known/security.txt", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/manifest.webmanifest", "kind": "beneficial", "url": "https://www.barcelona.cat/manifest.webmanifest", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/favicon.ico", "kind": "beneficial", "url": "https://www.barcelona.cat/favicon.ico", "found": true, "status": 200, "contentType": "image/x-icon" } ], "recommendations": [ { "title": "Add beneficial discoverability and maintenance files", "urgency": "low", "detail": "Missing beneficial file(s): /.well-known/security.txt, /manifest.webmanifest." } ] }, "mediaHints": { "score": 20, "urgency": "low", "checks": { "hasDarkMode": false, "hasMetaColorScheme": false, "hasDarkModeQuery": false, "autoplayingMedia": [], "autoplayCount": 0, "unmutedAutoplayCount": 0, "totalImages": 65, "imagesWithLazy": 53, "imagesWithoutLazy": 12 }, "recommendations": [ { "title": "Add dark mode support", "urgency": "medium", "detail": "No prefers-color-scheme: dark media query or color-scheme meta tag was found. Dark mode reduces energy use on OLED screens and improves user choice." } ] }, "wsgCustom": { "score": 85, "urgency": "medium", "data": { "hasPrintStyles": true, "hasReducedMotion": true, "media": { "totalImages": 70, "lazyImages": 54, "totalIframes": 1, "lazyIframes": 0 }, "typography": { "primaryFont": "\"Source Sans Pro\", \"Helvetica Neue\", Helvetica, Arial, sans-serif", "usesSystemFont": true }, "tracking": { "count": 0, "scripts": [] }, "semantics": { "hasNavigation": true, "hasMainContent": true } }, "recommendations": [ { "guideline": "11.3", "title": "Incomplete media lazy loading", "urgency": "medium", "detail": "Only 54/70 images use loading=\"lazy\". Global lazy loading reduces initial data transfer and energy consumption.", "wsid": "11.lazy loading", "assessor": "script", "example": "\"Description\"\n\n" }, { "guideline": "2.4", "title": "Review User Journey Efficiency", "urgency": "investigate", "detail": "Have a human walk through the main user journeys and verify they require the fewest steps possible. Unnecessary steps waste user time and device energy. Look for redundant confirmations, forced account creation, and non-essential interstitials.", "wsid": "2.minimize non-essential content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#minimize-non-essential-content-interactivity-or-journeys", "assessor": "human" }, { "guideline": "2.6", "title": "Check for Engagement Traps", "urgency": "investigate", "detail": "Manually review the page for patterns that artificially prolong engagement: infinite scroll, autoplay carousels, sticky overlays, and notification permission prompts. These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human" }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human" }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 91, "urgency": "high", "totalEstimatedSavingsBytes": 1609380.8000000003, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 881054.8000000002, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "estimatedSavingsBytes": 728326, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 860.41 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 711.26 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 1840139.8000000003, "totalEstimatedBlockingMs": 883, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 881054.8000000002, "estimatedBlockingMs": 0, "displayValue": "Est savings of 860 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 728326, "estimatedBlockingMs": 0, "displayValue": "Est savings of 711 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 83661, "estimatedBlockingMs": 0, "displayValue": "Est savings of 82 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 83309, "estimatedBlockingMs": 0, "displayValue": "Est savings of 81 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 63789, "estimatedBlockingMs": 0, "displayValue": "Est savings of 62 KiB", "urgency": "medium", "sourceAuditId": "unused-javascript" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 883, "displayValue": "Est savings of 880 ms", "urgency": "medium", "sourceAuditId": "render-blocking-resources" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 860.41 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 711.26 KB." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 81.70 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 81.36 KB." }, { "title": "Remove unused JavaScript", "urgency": "medium", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 62.29 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "medium", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 883 ms." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 167992.5954259777 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 6, "urgency": "medium", "transferBytes": 1766613, "css": { "unusedBytes": 83309, "ratio": 0.047157470255228505, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 63789, "duplicatedBytes": 0, "ratio": 0.036108078000105286, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 83309, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 63789, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 13, "urgency": "medium", "transferBytes": 1766613, "estimatedDeferrableBytes": 230759, "renderBlockingMs": 883, "breakdown": { "offscreenImageSavings": 83661, "unusedJavascriptSavings": 63789, "unusedCssSavings": 83309 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 63789, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "high", "estimatedSavingsBytes": 83309, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "medium", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 883, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 113400, "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_petit/public/foment_de_ciutat_ess_ocupacio_barris_252x228_1.jpg?itok=xJ7tCCBI", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90559, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139670, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76427, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15565, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7146, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5656, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=nWhOz0&url=https%3A%2F%2Fwww.barcelona.cat%2Fca%2Fimplicat", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 15, "urgency": "medium", "transferBytes": 1766613, "estimatedRedundantBytes": 147098, "redundancyRatio": 0.08326554825533379, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 83309, "displayValue": "Est savings of 81 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 63789, "displayValue": "Est savings of 62 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 83309, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 63789, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 15, "urgency": "medium", "totalTransferBytes": 1766613, "heavyRequestCount": 5, "heavyBytes": 387250, "heavyRatio": 0.21920477206949116, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_petit/public/foment_de_ciutat_ess_ocupacio_barris_252x228_1.jpg?itok=xJ7tCCBI", "transferSize": 113400, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90559, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76427, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54919, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_qDD4BCxE8K-iT7MRORwp32v03DlJblP9-xrYwOBWlQo.css?delta=5&language=ca&theme=barcelonacat_theme&include=eJyFz8GOwyAMBNAfCuXQD0ID8SasiI2wSZu_X6RKXa3EqidbM-8y-O5sOIgt4Mwq6l_HoeYloiUqwkiwICe1lldSP3R3JlJG_5-p2MidmR5_ge10kI8iptZQQ1p5Br7A6YrynHVbkYji1K6SeZuJnMThvWsm5FFmsUofWVCwhvsnUJssMXEYrMG_v0BPo8YoS0XDNkbu6tfWK8rtN7l1rj2WrDuti15qdPgIpR8d6Z1O&tcut5n", "transferSize": 51945, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "font", "count": 2, "transferBytes": 145478 }, { "resourceType": "image", "count": 1, "transferBytes": 113400 }, { "resourceType": "script", "count": 1, "transferBytes": 76427 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 51945 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 4, "transferBytes": 310823 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76427 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "medium", "estimatedSavingsBytes": 63789, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "medium", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 113400, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_petit/public/foment_de_ciutat_ess_ocupacio_barris_252x228_1.jpg?itok=xJ7tCCBI", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90559, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76427, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.01, "displayValue": "8.8 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 8.8 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 62 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 62 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 81 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 81 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 860 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 860 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 711 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 711 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 82 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 82 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 880 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 880 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.84, "displayValue": "3.8 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.8 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "1,462 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,462 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). 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These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human" }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human" }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 53, "urgency": "medium", "totalEstimatedSavingsBytes": 562765.45, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 313928.44999999995, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "estimatedSavingsBytes": 248837, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 306.57 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 243.00 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 764233.45, "totalEstimatedBlockingMs": 876, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 313928.44999999995, "estimatedBlockingMs": 0, "displayValue": "Est savings of 307 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 248837, "estimatedBlockingMs": 0, "displayValue": "Est savings of 243 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 87109, "estimatedBlockingMs": 0, "displayValue": "Est savings of 85 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 81878, "estimatedBlockingMs": 0, "displayValue": "Est savings of 80 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 876, "displayValue": "Est savings of 880 ms", "urgency": "medium", "sourceAuditId": "render-blocking-resources" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 32481, "estimatedBlockingMs": 0, "displayValue": "Est savings of 32 KiB", "urgency": "low", "sourceAuditId": "unused-javascript" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 306.57 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 243.00 KB." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 79.96 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "medium", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 876 ms." }, { "title": "Remove unused JavaScript", "urgency": "low", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 31.72 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 168009.1650139665 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.07 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.07 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 7, "urgency": "medium", "transferBytes": 1053372, "css": { "unusedBytes": 81878, "ratio": 0.07772942512236893, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 32481, "duplicatedBytes": 0, "ratio": 0.03083526047777993, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 81878, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 14, "urgency": "medium", "transferBytes": 1053372, "estimatedDeferrableBytes": 201468, "renderBlockingMs": 876, "breakdown": { "offscreenImageSavings": 87109, "unusedJavascriptSavings": 32481, "unusedCssSavings": 81878 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 87109, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "medium", "estimatedSavingsBytes": 81878, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "medium", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 876, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "high", "estimatedSavingsBytes": 224240, "url": "https://www.barcelona.cat/sites/default/files/styles/img_promo_mobile/public/amb_accessibilitat-insercio_laboral_5693_1.jpg", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90560, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy script from cdn.matomo.cloud", "area": "script", "urgency": "medium", "estimatedSavingsBytes": 76424, "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139462, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76424, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15566, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7150, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=M5KOGB&url=https%3A%2F%2Fwww.barcelona.cat%2Fca%2Fpagina-imatge-promocional", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 16, "urgency": "low", "transferBytes": 1053372, "estimatedRedundantBytes": 114359, "redundancyRatio": 0.10856468560014886, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 81878, "displayValue": "Est savings of 80 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 32481, "displayValue": "Est savings of 32 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 81878, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 26, "urgency": "medium", "totalTransferBytes": 1053372, "heavyRequestCount": 5, "heavyBytes": 495248, "heavyRatio": 0.4701548930482299, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/styles/img_promo_mobile/public/amb_accessibilitat-insercio_laboral_5693_1.jpg", "transferSize": 224240, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90560, "resourceType": "font", "mimeType": 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"count": 1, "transferBytes": 224240 }, { "resourceType": "font", "count": 2, "transferBytes": 145480 }, { "resourceType": "script", "count": 1, "transferBytes": 76424 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 49104 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 4, "transferBytes": 418824 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76424 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 87109, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "medium", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 224240, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/img_promo_mobile/public/amb_accessibilitat-insercio_laboral_5693_1.jpg", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90560, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76424, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0, "displayValue": "9.5 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 9.5 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 32 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 32 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 80 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 80 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 307 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 307 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 243 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 243 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 85 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 85 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 880 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 880 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.88, "displayValue": "3.5 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.5 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "928 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 928 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/ca/prova-video", "status": "ok", "finalUrl": "https://www.barcelona.cat/ca/prova-video", "performanceScore": 0.66, "bestPracticesScore": 1, "transferBytes": 774853, "co2Grams": 0.2968317720342, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, 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This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 81796, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 16, "urgency": "medium", "transferBytes": 774853, "estimatedDeferrableBytes": 201387, "renderBlockingMs": 876, "breakdown": { "offscreenImageSavings": 87110, "unusedJavascriptSavings": 32481, "unusedCssSavings": 81796 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 87110, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "medium", "estimatedSavingsBytes": 81796, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "medium", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 876, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90561, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 84137, "url": "https://www.barcelona.cat/themes/barcelonacat_theme/images/menu/viula.jpg", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy script from cdn.matomo.cloud", "area": "script", "urgency": "medium", "estimatedSavingsBytes": 76425, "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139473, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15566, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7161, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2860, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=9slT81&url=https%3A%2F%2Fwww.barcelona.cat%2Fca%2Fprova-video", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 18, "urgency": "low", "transferBytes": 774853, "estimatedRedundantBytes": 114277, "redundancyRatio": 0.14748216758533553, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 81796, "displayValue": "Est savings of 80 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 32481, "displayValue": "Est savings of 32 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 81796, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 21, "urgency": "medium", "totalTransferBytes": 774853, "heavyRequestCount": 4, "heavyBytes": 271001, "heavyRatio": 0.349745048415635, "heavyRequests": [ { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90561, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76425, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54921, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_evpTRQTawGYS1Ro7RbXq3hBxwat7AU-RJm1V8ZgzeaE.css?delta=5&language=ca&theme=barcelonacat_theme&include=eJyFzsGKwzAMBNAfiuvDfpAZOyJxcSQjydn272sodFnIsieJmXcY3Ac7DmJPOKuJxfcJ6HXJ0EJNGAWe5CTVupLFqUdwkTb7v0zHRuGs9P0b-E4HxSzi5oqeyspXYGuS0YL5s1XerkQtEvDZfiVMxsySgS19_Qe6ypILp8kU8fMlejgpoy0dim0u3i2uOjra7Se5De4jt2o7rYs9zemIGUYvwgyJSg&tcut5n", "transferSize": 49094, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "font", "count": 2, "transferBytes": 145482 }, { "resourceType": "script", "count": 1, "transferBytes": 76425 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 49094 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 3, "transferBytes": 194576 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 87110, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "medium", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90561, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76425, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.02, "displayValue": "8.1 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 8.1 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 32 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 32 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 80 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 80 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 71 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 71 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 57 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 57 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 85 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 85 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 880 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 880 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "server-response-time", "title": "Reduce initial server response time", "description": "Keep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).", "score": 0, "displayValue": "Root document took 680 ms", "impact": "high", "wsg": { "categoryId": "4", "categoryName": "Hosting, Infrastructure, and Systems", "id": "11", "title": "Ensure infrastructure fits project requirements", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements", "subheading": "Maintain the infrastructure you require rather than over-provisioning. Autoscale to meet demand and preserve hardware resources." }, "assessor": "script", "issueTemplate": "## Improve Reduce initial server response time\n\n- Lighthouse audit: server-response-time\n- Current value: Root document took 680 ms\n- WSG guideline: 11 Ensure infrastructure fits project requirements\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements\n\n### Why this matters\nKeep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.8, "displayValue": "4.0 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 4.0 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "937 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 937 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/ca/que-pots-fer-a-bcn", "status": "ok", "finalUrl": "https://www.barcelona.cat/ca/que-pots-fer-a-bcn", "performanceScore": 0.65, "bestPracticesScore": 1, "transferBytes": 2392063, "co2Grams": 0.9163548429281999, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, 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"Consulta l'agenda d'activitats, esdeveniments culturals, centres esportius i parcs que t'ofereix la ciutat de Barcelona.", "robots": "", "canonical": "https://www.barcelona.cat/ca/que-pots-fer-a-bcn", "ogTitle": "Descobreix tot el que pots fer a Barcelona", "ogDescription": "No et perdis res! Explora la guia d'activitats de la ciutat: des de cultura fins a centres esportius i parcs a Barcelona.", "ogType": "Web", "ogUrl": "https://www.barcelona.cat/ca/que-pots-fer-a-bcn", "twitterCard": "summary_large_image", "ldJsonCount": 0, "validLdJsonCount": 0, "invalidLdJsonCount": 0 }, "recommendations": [ { "title": "Metadata structure looks healthy", "urgency": "low", "detail": "Core machine-readable metadata is present and no structural issues were detected." } ] }, "layoutAdaptation": { "score": 34, "urgency": "medium", "checks": { "testedMobile": true, "testedTablet": true, "horizontalOverflowOnMobile": false, "horizontalOverflowOnTablet": false, "mobileSmallTapTargets": 46, "tabletSmallTapTargets": 33, "fixedWidthOffenders": 2, "oversizedMedia": 0, "scanErrors": 0 }, "perDevice": [ { "device": "mobile", "viewportWidth": 390, "viewportHeight": 844, "contentWidth": 390, "horizontalOverflowPx": 0, "hasHorizontalOverflow": false, "fixedWidthOffenders": 1, "smallTapTargets": 46, "oversizedMedia": 0 }, { "device": "tablet", "viewportWidth": 820, "viewportHeight": 1180, "contentWidth": 820, "horizontalOverflowPx": 0, "hasHorizontalOverflow": false, "fixedWidthOffenders": 1, "smallTapTargets": 33, "oversizedMedia": 0 } ], "recommendations": [ { "title": "Increase touch target sizes", "urgency": "high", "detail": "Ensure interactive controls are at least 44x44 CSS px. Detected 46 small targets on mobile and 33 on tablet." }, { "title": "Refactor fixed-width components", "urgency": "medium", "detail": "2 element(s) exceeded viewport width in tested layouts; use responsive component constraints." } ] }, "securityLight": { "score": 59, "urgency": "medium", "checks": { "isHttps": true, "hasHsts": false, "hasCsp": false, "hasXContentTypeOptions": true, "hasReferrerPolicy": false, "hasPermissionsPolicy": false, "exposesServerFingerprint": true, "externalScriptCount": 7, "externalScriptsWithoutIntegrity": 7, "vulnerableLibraryCount": 0 }, "observed": { "headers": { "cache-control": "max-age=300, public", "content-encoding": "gzip", "content-language": "ca", "content-length": "14249", "content-type": "text/html; charset=UTF-8", "date": "Mon, 13 Apr 2026 22:41:54 GMT", "etag": "\"1776120114-gzip\"", "expires": "Sun, 19 Nov 1978 05:00:00 GMT", "last-modified": "Mon, 13 Apr 2026 22:41:54 GMT", "server": "nginx", "vary": "Cookie,Accept-Encoding", "via": "1.1 ca2190123e61f1744d1210c24c87c840.cloudfront.net (CloudFront)", "x-amz-cf-id": "p_L63PJ6hzEDM_z2exX0FkdHlKSTqb-GoDuDxycgBrz9X5_u1laF3g==", "x-amz-cf-pop": "IAD12-P5", "x-cache": "Miss from cloudfront", "x-content-type-options": "nosniff", "x-frame-options": "SAMEORIGIN", "x-generator": "Drupal 10 (https://www.drupal.org)" }, "vulnerableLibrariesAuditScore": null, "vulnerableLibraries": [] }, "recommendations": [ { "title": "Add a Content-Security-Policy header", "urgency": "high", "detail": "Add an appropriate CSP to reduce script injection and resource loading risk." }, { "title": "Enable Strict-Transport-Security", "urgency": "medium", "detail": "Set a Strict-Transport-Security header to enforce HTTPS on repeat visits." }, { "title": "Define a Referrer-Policy", "urgency": "low", "detail": "Set a referrer policy to reduce unnecessary URL data leakage." }, { "title": "Define a Permissions-Policy", "urgency": "low", "detail": "Restrict browser capabilities to only what the application needs." }, { "title": "Add SRI to external scripts", "urgency": "medium", "detail": "7 external script tag(s) are missing integrity attributes." } ] }, "expectedFiles": { "score": 25, "urgency": "low", "origin": "https://www.barcelona.cat", "checks": [ { "path": "/robots.txt", "kind": "expected", "url": "https://www.barcelona.cat/robots.txt", "found": true, "status": 200, "contentType": "text/plain" }, { "path": "/sitemap.xml", "kind": "beneficial", "url": "https://www.barcelona.cat/sitemap.xml", "found": true, "status": 200, "contentType": "application/xml; charset=utf-8" }, { "path": "/.well-known/security.txt", "kind": "beneficial", "url": "https://www.barcelona.cat/.well-known/security.txt", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/manifest.webmanifest", "kind": "beneficial", "url": "https://www.barcelona.cat/manifest.webmanifest", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/favicon.ico", "kind": "beneficial", "url": "https://www.barcelona.cat/favicon.ico", "found": true, "status": 200, "contentType": "image/x-icon" } ], "recommendations": [ { "title": "Add beneficial discoverability and maintenance files", "urgency": "low", "detail": "Missing beneficial file(s): /.well-known/security.txt, /manifest.webmanifest." } ] }, "mediaHints": { "score": 20, "urgency": "low", "checks": { "hasDarkMode": false, "hasMetaColorScheme": false, "hasDarkModeQuery": false, "autoplayingMedia": [], "autoplayCount": 0, "unmutedAutoplayCount": 0, "totalImages": 63, "imagesWithLazy": 34, "imagesWithoutLazy": 29 }, "recommendations": [ { "title": "Add dark mode support", "urgency": "medium", "detail": "No prefers-color-scheme: dark media query or color-scheme meta tag was found. Dark mode reduces energy use on OLED screens and improves user choice." } ] }, "wsgCustom": { "score": 85, "urgency": "medium", "data": { "hasPrintStyles": true, "hasReducedMotion": true, "media": { "totalImages": 68, "lazyImages": 35, "totalIframes": 1, "lazyIframes": 0 }, "typography": { "primaryFont": "\"Source Sans Pro\", \"Helvetica Neue\", Helvetica, Arial, sans-serif", "usesSystemFont": true }, "tracking": { "count": 0, "scripts": [] }, "semantics": { "hasNavigation": true, "hasMainContent": true } }, "recommendations": [ { "guideline": "11.3", "title": "Incomplete media lazy loading", "urgency": "medium", "detail": "Only 35/68 images use loading=\"lazy\". Global lazy loading reduces initial data transfer and energy consumption.", "wsid": "11.lazy loading", "assessor": "script", "example": "\"Description\"\n\n" }, { "guideline": "2.4", "title": "Review User Journey Efficiency", "urgency": "investigate", "detail": "Have a human walk through the main user journeys and verify they require the fewest steps possible. Unnecessary steps waste user time and device energy. Look for redundant confirmations, forced account creation, and non-essential interstitials.", "wsid": "2.minimize non-essential content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#minimize-non-essential-content-interactivity-or-journeys", "assessor": "human" }, { "guideline": "2.6", "title": "Check for Engagement Traps", "urgency": "investigate", "detail": "Manually review the page for patterns that artificially prolong engagement: infinite scroll, autoplay carousels, sticky overlays, and notification permission prompts. These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human" }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human" }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 2538217.3499999996, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 1380798.3499999996, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "estimatedSavingsBytes": 1157419, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.32 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.10 MB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 2763249.3499999996, "totalEstimatedBlockingMs": 1502, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 1380798.3499999996, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,348 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 1157419, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,130 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1502, "displayValue": "Est savings of 1,500 ms", "urgency": "high", "sourceAuditId": "render-blocking-resources" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 87109, "estimatedBlockingMs": 0, "displayValue": "Est savings of 85 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 83298, "estimatedBlockingMs": 0, "displayValue": "Est savings of 81 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 54625, "estimatedBlockingMs": 0, "displayValue": "Est savings of 53 KiB", "urgency": "medium", "sourceAuditId": "unused-javascript" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.32 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.10 MB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1502 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 81.35 KB." }, { "title": "Remove unused JavaScript", "urgency": "medium", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 53.34 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 167994.32723463688 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 7, "urgency": "medium", "transferBytes": 2392063, "css": { "unusedBytes": 83298, "ratio": 0.03482266144328139, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 54625, "duplicatedBytes": 0, "ratio": 0.022835937013364616, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.25, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 83298, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 54625, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 18, "urgency": "high", "transferBytes": 2392063, "estimatedDeferrableBytes": 225032, "renderBlockingMs": 1502, "breakdown": { "offscreenImageSavings": 87109, "unusedJavascriptSavings": 54625, "unusedCssSavings": 83298 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 87109, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 54625, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external 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non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 131591, "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_paginat/public/banner_05_2.jpg?itok=v2FZuICQ", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139457, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": 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"https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2862, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=zF0DqZ&url=https%3A%2F%2Fwww.barcelona.cat%2Fca%2Fque-pots-fer-a-bcn", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 23, "urgency": "medium", "transferBytes": 2392063, "estimatedRedundantBytes": 137923, "redundancyRatio": 0.057658598456646, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 83298, "displayValue": "Est savings of 81 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 54625, "displayValue": "Est savings of 53 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 83298, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 54625, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 21, "urgency": "high", "totalTransferBytes": 2392063, "heavyRequestCount": 8, "heavyBytes": 728500, "heavyRatio": 0.3045488350432242, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_paginat/public/banner_05_2.jpg?itok=v2FZuICQ", "transferSize": 131591, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_menu/public/parcs%20i%20jardins%208789.jpg?itok=uTySxKDK", "transferSize": 111821, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_petit/public/edifici_252x228_2.jpg?itok=bXAyHXRG", "transferSize": 105744, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_petit/public/tibidaboia-252x228.jpg?itok=Qv1xI3_6", "transferSize": 105503, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90560, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76425, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54920, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_qDD4BCxE8K-iT7MRORwp32v03DlJblP9-xrYwOBWlQo.css?delta=6&language=ca&theme=barcelonacat_theme&include=eJyFz8FuxCAMBNAfCsuhH4QG4ia0DkbYpJu_L9JKW1VitSdbM-8y-OrFcFCxgDOrqH8ch5qXiJaIpSDBgpzUWl5J_dDdmQiP_pWp2MidmX7-A9vpIB9FTK2hhrSWGfhESVeU-6zbWCLYqV2cyzYTOYnDc9dMKOf07ZASqebINDXSRxYURcPHO1CbLDGVMFiDf36B7katgJeKhm0s3tWvrVfw7S-59VJ75Kw7rYteanT4CKVfKxCiTQ&tcut5n", "transferSize": 51936, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "image", "count": 4, "transferBytes": 454659 }, { "resourceType": "font", "count": 2, "transferBytes": 145480 }, { "resourceType": "script", "count": 1, "transferBytes": 76425 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 51936 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 7, "transferBytes": 652075 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 87109, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "medium", "estimatedSavingsBytes": 54625, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 131591, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_paginat/public/banner_05_2.jpg?itok=v2FZuICQ", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.07, "displayValue": "6.7 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 6.7 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 53 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 53 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 81 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 81 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 1,348 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 1,348 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 1,130 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 1,130 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 85 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 85 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,500 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,500 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0, "displayValue": "1,514 elements", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,514 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.82, "displayValue": "3.9 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.9 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. 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Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. 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Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 3958833.35, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 2146666.35, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "estimatedSavingsBytes": 1812167, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 2.05 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.73 MB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 4187956.35, "totalEstimatedBlockingMs": 1510, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 2146666.35, "estimatedBlockingMs": 0, "displayValue": "Est savings of 2,096 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 1812167, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,770 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1510, "displayValue": "Est savings of 1,510 ms", "urgency": "high", "sourceAuditId": "render-blocking-resources" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 87110, "estimatedBlockingMs": 0, "displayValue": "Est savings of 85 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 83327, "estimatedBlockingMs": 0, "displayValue": "Est savings of 81 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 58686, "estimatedBlockingMs": 0, "displayValue": "Est savings of 57 KiB", "urgency": "medium", "sourceAuditId": "unused-javascript" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 2.05 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.73 MB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1510 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 81.37 KB." }, { "title": "Remove unused JavaScript", "urgency": "medium", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 57.31 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 167997.4459846369 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 7, "urgency": "medium", "transferBytes": 3220295, "css": { "unusedBytes": 83327, "ratio": 0.025875579721733568, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 58686, "duplicatedBytes": 0, "ratio": 0.018223796267112173, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.25, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 83327, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 58686, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 17, "urgency": "high", "transferBytes": 3220295, "estimatedDeferrableBytes": 229123, "renderBlockingMs": 1510, "breakdown": { "offscreenImageSavings": 87110, "unusedJavascriptSavings": 58686, "unusedCssSavings": 83327 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 87110, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 58686, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "high", "estimatedSavingsBytes": 83327, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1510, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 158293, "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/cerques_feina_mercat_laboral_0256.jpg?itok=abQPL1uE", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139456, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31745, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15566, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7144, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=QrHrOc&url=https%3A%2F%2Fwww.barcelona.cat%2Fca%2Ftreball-i-empresa", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 22, "urgency": "medium", "transferBytes": 3220295, "estimatedRedundantBytes": 142013, "redundancyRatio": 0.044099375988845745, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 83327, "displayValue": "Est savings of 81 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 58686, "displayValue": "Est savings of 57 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 83327, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 58686, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 35, "urgency": "high", "totalTransferBytes": 3220295, "heavyRequestCount": 17, "heavyBytes": 1972829, "heavyRatio": 0.6126236882024784, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/cerques_feina_mercat_laboral_0256.jpg?itok=abQPL1uE", "transferSize": 158293, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/tens%20un%20negoci-nous%20horitzons%203746.jpg?itok=uRlm3ztW", "transferSize": 145980, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/emprenedoria_social_387x223.jpg?itok=4TFG8jfn", "transferSize": 138819, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/190331_f_packfotos_panoramiquesnovesciutat_2056.jpeg?itok=9CGKi9q_", "transferSize": 137846, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/formaci%C3%B2%20continua-cibernarium%209731.jpg?itok=1IncVAns", "transferSize": 133963, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/tens_un_negoci_sector_estrategic%20.jpg?itok=sQIcUf3T", "transferSize": 132845, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/vols_emprendre_ubicat_9592.jpg?itok=6jnocCY8", "transferSize": 132755, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/Cerques_feina_prestacions_3443.jpg?itok=Iv5w4R3J", "transferSize": 132485, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/tens_un_negoci_informat_9782.jpg?itok=zPeXebmg", "transferSize": 130957, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/cerques_feina_assesorat_0440.jpg?itok=0BMoXkQw", "transferSize": 121996, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/Emprenedoria%20Glories%20Barcelona_387x223.jpg?itok=M9nQLGxO", "transferSize": 114520, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/cerques_feina_eines_9597.jpg?itok=xhGYMCD1", "transferSize": 112182, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/20210305_presentaciofestivalsperlaculturasegura_02_0.jpeg?itok=4J6qINE5", "transferSize": 106341, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90560, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76425, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": 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"groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 16, "transferBytes": 1896404 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 87110, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "medium", "estimatedSavingsBytes": 58686, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 158293, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/cerques_feina_mercat_laboral_0256.jpg?itok=abQPL1uE", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.03, "displayValue": "7.6 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 7.6 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 57 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 57 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 81 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 81 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 2,096 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 2,096 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 1,770 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 1,770 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 85 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 85 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,510 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,510 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0, "displayValue": "1,522 elements", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,522 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.85, "displayValue": "3.7 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.7 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "total-byte-weight", "title": "Avoid enormous network payloads", "description": "Large network payloads cost users real money and are highly correlated with long load times. [Learn how to reduce payload sizes](https://developer.chrome.com/docs/lighthouse/performance/total-byte-weight/).", "score": 0.5, "displayValue": "Total size was 3,145 KiB", "impact": "medium", "wsg": { "categoryId": "5", "categoryName": "Business Strategy And Product Management", "id": "25", "title": "Define performance and environmental budgets", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#define-performance-and-environmental-budgets", "subheading": "Set budgets, taking people, planet, and performance into account alongside baselines, targets, evidence, and resources to help meet KPIs." }, "assessor": "script", "issueTemplate": "## Improve Avoid enormous network payloads\n\n- Lighthouse audit: total-byte-weight\n- Current value: Total size was 3,145 KiB\n- WSG guideline: 25 Define performance and environmental budgets\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#define-performance-and-environmental-budgets\n\n### Why this matters\nLarge network payloads cost users real money and are highly correlated with long load times. [Learn how to reduce payload sizes](https://developer.chrome.com/docs/lighthouse/performance/total-byte-weight/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/ca/viure-a-bcn", "status": "ok", "finalUrl": "https://www.barcelona.cat/ca/viure-a-bcn", "performanceScore": 0.64, "bestPracticesScore": 1, "transferBytes": 2322493, "co2Grams": 0.8897038699302, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, 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Estimated byte savings: 1.28 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.00 MB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1511 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 113.50 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 81.46 KB." }, { "title": "Remove unused JavaScript", "urgency": "medium", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 53.34 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 167996.84598463692 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 5, "urgency": "medium", "transferBytes": 2322493, "css": { "unusedBytes": 83415, "ratio": 0.03591614700238063, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 54625, "duplicatedBytes": 0, "ratio": 0.02351998477498102, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 83415, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 54625, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 18, "urgency": "high", "transferBytes": 2322493, "estimatedDeferrableBytes": 254260, "renderBlockingMs": 1511, "breakdown": { "offscreenImageSavings": 116220, "unusedJavascriptSavings": 54625, "unusedCssSavings": 83415 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 116220, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 54625, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "high", "estimatedSavingsBytes": 83415, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1511, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of 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"listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7144, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2860, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=kQD5XH&url=https%3A%2F%2Fwww.barcelona.cat%2Fca%2Fviure-a-bcn", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 13, "urgency": "medium", "transferBytes": 2322493, "estimatedRedundantBytes": 138040, "redundancyRatio": 0.05943613177736166, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 83415, "displayValue": "Est savings of 81 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 54625, "displayValue": "Est savings of 53 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 83415, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 54625, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the 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"https://www.barcelona.cat/sites/default/files/css/css_qDD4BCxE8K-iT7MRORwp32v03DlJblP9-xrYwOBWlQo.css?delta=5&language=ca&theme=barcelonacat_theme&include=eJyFz0FqxTAMBNALxd-LHsiMHTVxcSQjyenP7Wso_FJI6Upi5m0GH4MdB7EnnNXE4vcJ6HXJ0EJNGAWe5CTVupLFqUdwkTb7v0zHRuGs9Pkb-E4HxSzi5oqeysp34B1crizPu25rktGC-dUqb3eiFgl47boTJmNmycCW3v4DXWXJhdNkivj6Ej2dlNGWDsU21-wWVx0d7fGTPAb3kVu1ndbFLnM6YobRF2idlFA&tcut5n", "transferSize": 51942, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "font", "count": 2, "transferBytes": 145481 }, { "resourceType": "image", "count": 1, "transferBytes": 103822 }, { "resourceType": "script", "count": 1, "transferBytes": 76425 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 51942 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 4, "transferBytes": 301245 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 116220, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "medium", "estimatedSavingsBytes": 54625, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 103822, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_menu/public/nens_nenes_paola.jpg?itok=8VB08syh", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90560, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76425, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.02, "displayValue": "8.2 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 8.2 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 53 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 53 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 81 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 81 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 1,316 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 1,316 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 1,027 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 1,027 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,510 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,510 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "server-response-time", "title": "Reduce initial server response time", "description": "Keep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).", "score": 0, "displayValue": "Root document took 620 ms", "impact": "high", "wsg": { "categoryId": "4", "categoryName": "Hosting, Infrastructure, and Systems", "id": "11", "title": "Ensure infrastructure fits project requirements", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements", "subheading": "Maintain the infrastructure you require rather than over-provisioning. Autoscale to meet demand and preserve hardware resources." }, "assessor": "script", "issueTemplate": "## Improve Reduce initial server response time\n\n- Lighthouse audit: server-response-time\n- Current value: Root document took 620 ms\n- WSG guideline: 11 Ensure infrastructure fits project requirements\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements\n\n### Why this matters\nKeep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.86, "displayValue": "3.7 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.7 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0.5, "displayValue": "Est savings of 113 KiB", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 113 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "1,433 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,433 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/en/catalan-national-day-2022", "status": "ok", "finalUrl": "https://www.barcelona.cat/en/catalan-national-day-2022", "performanceScore": 0.64, "bestPracticesScore": 1, "transferBytes": 828667, "co2Grams": 0.3174469144938001, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31745, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "stylesheet", "requestCount": 1, "transferBytes": 24659, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", 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This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 81873, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 16, "urgency": "medium", "transferBytes": 828667, "estimatedDeferrableBytes": 201463, "renderBlockingMs": 900, "breakdown": { "offscreenImageSavings": 87109, "unusedJavascriptSavings": 32481, "unusedCssSavings": 81873 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 87109, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "medium", "estimatedSavingsBytes": 81873, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "medium", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 900, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90560, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 84136, "url": "https://www.barcelona.cat/themes/barcelonacat_theme/images/menu/viula.jpg", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy script from cdn.matomo.cloud", "area": "script", "urgency": "medium", "estimatedSavingsBytes": 76425, "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139664, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31745, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15565, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7143, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5656, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=huVL5I&url=https%3A%2F%2Fwww.barcelona.cat%2Fen%2Fcatalan-national-day-2022", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 18, "urgency": "low", "transferBytes": 828667, "estimatedRedundantBytes": 114354, "redundancyRatio": 0.1379975309744445, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 81873, "displayValue": "Est savings of 80 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 32481, "displayValue": "Est savings of 32 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 81873, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 20, "urgency": "medium", "totalTransferBytes": 828667, "heavyRequestCount": 4, "heavyBytes": 271011, "heavyRatio": 0.3270445184857126, "heavyRequests": [ { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90560, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76425, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54920, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_evpTRQTawGYS1Ro7RbXq3hBxwat7AU-RJm1V8ZgzeaE.css?delta=5&language=en&theme=barcelonacat_theme&include=eJyFzkEKwzAMBMAPxfjQB5m1I1IXRzKSkja_r6EQKKT0pGV3DsJjY8dK7Al7NbH4OQG9ThlaqAmjwJPspFpnsjj0Flykjf2X6Vgo7JWe38DvtFLMIm6u6KnMfAWWJhktmB-t8nIlapGA8_crYbKNLhnY0u0f6CpTLpwGU8QzJXo5KaNNdpjTGjOM3gg5eRY&tcut5n", "transferSize": 49106, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "font", "count": 2, "transferBytes": 145480 }, { "resourceType": "script", "count": 1, "transferBytes": 76425 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 49106 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 3, "transferBytes": 194586 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 87109, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "medium", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90560, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76425, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.01, "displayValue": "8.6 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 8.6 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 32 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 32 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 80 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 80 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 123 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 123 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 85 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 85 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 900 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 900 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "server-response-time", "title": "Reduce initial server response time", "description": "Keep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).", "score": 0, "displayValue": "Root document took 650 ms", "impact": "high", "wsg": { "categoryId": "4", "categoryName": "Hosting, Infrastructure, and Systems", "id": "11", "title": "Ensure infrastructure fits project requirements", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements", "subheading": "Maintain the infrastructure you require rather than over-provisioning. Autoscale to meet demand and preserve hardware resources." }, "assessor": "script", "issueTemplate": "## Improve Reduce initial server response time\n\n- Lighthouse audit: server-response-time\n- Current value: Root document took 650 ms\n- WSG guideline: 11 Ensure infrastructure fits project requirements\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements\n\n### Why this matters\nKeep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.78, "displayValue": "4.2 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 4.2 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0.5, "displayValue": "Est savings of 57 KiB", "impact": "medium", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 57 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "893 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 893 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/en/discoverbcn", "status": "ok", "finalUrl": "https://www.barcelona.cat/en/discoverbcn", "performanceScore": 0.66, "bestPracticesScore": 1, "transferBytes": 1956574, "co2Grams": 0.7495271071236, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76426, 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Barcelona, its points of interest, popular culture and the most emblematic places in your city.", "robots": "", "canonical": "https://www.barcelona.cat/en/discoverbcn", "ogTitle": "Discover Barcelona", "ogDescription": "Want to discover Barcelona? 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Detected 38 small targets on mobile and 33 on tablet." } ] }, "securityLight": { "score": 59, "urgency": "medium", "checks": { "isHttps": true, "hasHsts": false, "hasCsp": false, "hasXContentTypeOptions": true, "hasReferrerPolicy": false, "hasPermissionsPolicy": false, "exposesServerFingerprint": true, "externalScriptCount": 7, "externalScriptsWithoutIntegrity": 7, "vulnerableLibraryCount": 0 }, "observed": { "headers": { "cache-control": "max-age=300, public", "content-encoding": "gzip", "content-language": "en", "content-length": "12122", "content-type": "text/html; charset=UTF-8", "date": "Mon, 13 Apr 2026 22:42:54 GMT", "etag": "\"1776120173-gzip\"", "expires": "Sun, 19 Nov 1978 05:00:00 GMT", "last-modified": "Mon, 13 Apr 2026 22:42:53 GMT", "server": "nginx", "vary": "Cookie,Accept-Encoding", "via": "1.1 ca2190123e61f1744d1210c24c87c840.cloudfront.net (CloudFront)", "x-amz-cf-id": "PeuhhhQvF_HDXD_RUkRPyMips97Nmmthqy7gx7VCiouUDDdLDkn6Ww==", "x-amz-cf-pop": "IAD12-P5", "x-cache": "Miss from cloudfront", "x-content-type-options": "nosniff", "x-frame-options": "SAMEORIGIN", "x-generator": "Drupal 10 (https://www.drupal.org)" }, "vulnerableLibrariesAuditScore": null, "vulnerableLibraries": [] }, "recommendations": [ { "title": "Add a Content-Security-Policy header", "urgency": "high", "detail": "Add an appropriate CSP to reduce script injection and resource loading risk." }, { "title": "Enable Strict-Transport-Security", "urgency": "medium", "detail": "Set a Strict-Transport-Security header to enforce HTTPS on repeat visits." }, { "title": "Define a Referrer-Policy", "urgency": "low", "detail": "Set a referrer policy to reduce unnecessary URL data leakage." }, { "title": "Define a Permissions-Policy", "urgency": "low", "detail": "Restrict browser capabilities to only what the application needs." }, { "title": "Add SRI to external scripts", "urgency": "medium", "detail": "7 external script tag(s) are missing integrity attributes." } ] }, "expectedFiles": { "score": 25, "urgency": "low", "origin": "https://www.barcelona.cat", "checks": [ { "path": "/robots.txt", "kind": "expected", "url": "https://www.barcelona.cat/robots.txt", "found": true, "status": 200, "contentType": "text/plain" }, { "path": "/sitemap.xml", "kind": "beneficial", "url": "https://www.barcelona.cat/sitemap.xml", "found": true, "status": 200, "contentType": "application/xml; charset=utf-8" }, { "path": "/.well-known/security.txt", "kind": "beneficial", "url": "https://www.barcelona.cat/.well-known/security.txt", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/manifest.webmanifest", "kind": "beneficial", "url": "https://www.barcelona.cat/manifest.webmanifest", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/favicon.ico", "kind": "beneficial", "url": "https://www.barcelona.cat/favicon.ico", "found": true, "status": 200, "contentType": "image/x-icon" } ], "recommendations": [ { "title": "Add beneficial discoverability and maintenance files", "urgency": "low", "detail": "Missing beneficial file(s): /.well-known/security.txt, /manifest.webmanifest." } ] }, "mediaHints": { "score": 27, "urgency": "low", "checks": { "hasDarkMode": false, "hasMetaColorScheme": false, "hasDarkModeQuery": false, "autoplayingMedia": [], "autoplayCount": 0, "unmutedAutoplayCount": 0, "totalImages": 37, "imagesWithLazy": 14, "imagesWithoutLazy": 23 }, "recommendations": [ { "title": "Add dark mode support", "urgency": "medium", "detail": "No prefers-color-scheme: dark media query or color-scheme meta tag was found. Dark mode reduces energy use on OLED screens and improves user choice." }, { "title": "Add loading=\"lazy\" to images", "urgency": "high", "detail": "23 of 37 image(s) lack an explicit loading=\"lazy\" attribute. Lazy loading defers below-fold images and reduces initial page weight." } ] }, "wsgCustom": { "score": 85, "urgency": "medium", "data": { "hasPrintStyles": true, "hasReducedMotion": true, "media": { "totalImages": 42, "lazyImages": 15, "totalIframes": 1, "lazyIframes": 0 }, "typography": { "primaryFont": "\"Source Sans Pro\", \"Helvetica Neue\", Helvetica, Arial, sans-serif", "usesSystemFont": true }, "tracking": { "count": 0, "scripts": [] }, "semantics": { "hasNavigation": true, "hasMainContent": true } }, "recommendations": [ { "guideline": "11.3", "title": "Incomplete media lazy loading", "urgency": "medium", "detail": "Only 15/42 images use loading=\"lazy\". Global lazy loading reduces initial data transfer and energy consumption.", "wsid": "11.lazy loading", "assessor": "script", "example": "\"Description\"\n\n" }, { "guideline": "2.4", "title": "Review User Journey Efficiency", "urgency": "investigate", "detail": "Have a human walk through the main user journeys and verify they require the fewest steps possible. Unnecessary steps waste user time and device energy. Look for redundant confirmations, forced account creation, and non-essential interstitials.", "wsid": "2.minimize non-essential content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#minimize-non-essential-content-interactivity-or-journeys", "assessor": "human" }, { "guideline": "2.6", "title": "Check for Engagement Traps", "urgency": "investigate", "detail": "Manually review the page for patterns that artificially prolong engagement: infinite scroll, autoplay carousels, sticky overlays, and notification permission prompts. These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human" }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human" }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 97, "urgency": "high", "totalEstimatedSavingsBytes": 1889839.6500000001, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 1037339.6500000001, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "estimatedSavingsBytes": 852500, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1013.03 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 832.52 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 2115221.6500000004, "totalEstimatedBlockingMs": 1637, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 1037339.6500000001, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,013 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 852500, "estimatedBlockingMs": 0, "displayValue": "Est savings of 833 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1637, "displayValue": "Est savings of 1,640 ms", "urgency": "high", "sourceAuditId": "render-blocking-resources" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 87108, "estimatedBlockingMs": 0, "displayValue": "Est savings of 85 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 83649, "estimatedBlockingMs": 0, "displayValue": "Est savings of 82 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 54625, "estimatedBlockingMs": 0, "displayValue": "Est savings of 53 KiB", "urgency": "medium", "sourceAuditId": "unused-javascript" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1013.03 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 832.52 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1637 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 81.69 KB." }, { "title": "Remove unused JavaScript", "urgency": "medium", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 53.34 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 167992.62695530726 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 5, "urgency": "medium", "transferBytes": 1956574, "css": { "unusedBytes": 83649, "ratio": 0.04275279135877304, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 54625, "duplicatedBytes": 0, "ratio": 0.02791869870498126, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 83649, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 54625, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 18, "urgency": "high", "transferBytes": 1956574, "estimatedDeferrableBytes": 225382, "renderBlockingMs": 1637, "breakdown": { "offscreenImageSavings": 87108, "unusedJavascriptSavings": 54625, "unusedCssSavings": 83649 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 87108, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 54625, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "high", "estimatedSavingsBytes": 83649, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1637, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "high", "estimatedSavingsBytes": 261365, "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_gran/public/destacat-cultura%20popular4071.jpg?itok=cA32eUx7", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139459, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76426, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": 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null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=yAxckU&url=https%3A%2F%2Fwww.barcelona.cat%2Fen%2Fdiscoverbcn", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 14, "urgency": "medium", "transferBytes": 1956574, "estimatedRedundantBytes": 138274, "redundancyRatio": 0.0706714900637543, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 83649, "displayValue": "Est savings of 82 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 54625, "displayValue": "Est savings of 53 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 83649, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 54625, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 34, "urgency": "high", "totalTransferBytes": 1956574, "heavyRequestCount": 9, "heavyBytes": 1128111, "heavyRatio": 0.5765746657167069, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_gran/public/destacat-cultura%20popular4071.jpg?itok=cA32eUx7", "transferSize": 261365, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_gran/public/dues-nenes-conversen-assegudes-als-bancs_528x228px_1.jpg?itok=KK65rUY_", "transferSize": 181456, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_gran/public/biblioteca2_528x228.jpg?itok=M55yvOgb", "transferSize": 156169, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_gran/public/llibreria_528x228_1.jpg?itok=p3R2bHNi", "transferSize": 142296, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_menu/public/memoria_tradicio.jpg?itok=j2Tlac4l", "transferSize": 112984, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90559, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76426, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54919, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_qDD4BCxE8K-iT7MRORwp32v03DlJblP9-xrYwOBWlQo.css?delta=5&language=en&theme=barcelonacat_theme&include=eJyFz0FqxTAMBNALxd-LHsiMHTVxcSQjyenP7Wso_FJI6Upi5m0GH4MdB7EnnNXE4vcJ6HXJ0EJNGAWe5CTVupLFqUdwkTb7v0zHRuGs9Pkb-E4HxSzi5oqeysp34B1crizPu25rktGC-dUqb3eiFgl47boTJmNmycCW3v4DXWXJhdNkivj6Ej2dlNGWDsU21-wWVx0d7fGTPAb3kVu1ndbFLnM6YobRF2idlFA&tcut5n", "transferSize": 51937, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "image", "count": 5, "transferBytes": 854270 }, { "resourceType": "font", "count": 2, "transferBytes": 145478 }, { "resourceType": "script", "count": 1, "transferBytes": 76426 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 51937 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 8, "transferBytes": 1051685 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76426 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 87108, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "medium", "estimatedSavingsBytes": 54625, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 261365, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_gran/public/destacat-cultura%20popular4071.jpg?itok=cA32eUx7", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.02, "displayValue": "8.0 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 8.0 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 53 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 53 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 82 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 82 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 1,013 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 1,013 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 833 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 833 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 85 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 85 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,640 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,640 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.81, "displayValue": "4.0 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 4.0 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "1,058 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,058 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). 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The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 92, "urgency": "high", "totalEstimatedSavingsBytes": 1608635.85, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 880657.8500000001, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "estimatedSavingsBytes": 727978, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 860.02 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 710.92 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 1851148.85, "totalEstimatedBlockingMs": 1465, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 880657.8500000001, "estimatedBlockingMs": 0, "displayValue": "Est savings of 860 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 727978, "estimatedBlockingMs": 0, "displayValue": "Est savings of 711 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1465, "displayValue": "Est savings of 1,470 ms", "urgency": "high", "sourceAuditId": "render-blocking-resources" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 94774, "estimatedBlockingMs": 0, "displayValue": "Est savings of 93 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 83335, "estimatedBlockingMs": 0, "displayValue": "Est savings of 81 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 64404, "estimatedBlockingMs": 0, "displayValue": "Est savings of 63 KiB", "urgency": "medium", "sourceAuditId": "unused-javascript" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 860.02 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 710.92 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1465 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 92.55 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 81.38 KB." }, { "title": "Remove unused JavaScript", "urgency": "medium", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 62.89 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 167994.8832053073 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 6, "urgency": "medium", "transferBytes": 1748335, "css": { "unusedBytes": 83335, "ratio": 0.04766535017602462, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 64404, "duplicatedBytes": 0, "ratio": 0.03683733380616415, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 83335, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 64404, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 19, "urgency": "high", "transferBytes": 1748335, "estimatedDeferrableBytes": 242513, "renderBlockingMs": 1465, "breakdown": { "offscreenImageSavings": 94774, "unusedJavascriptSavings": 64404, "unusedCssSavings": 83335 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 94774, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 64404, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "high", "estimatedSavingsBytes": 83335, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1465, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 113438, "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_petit/public/foment_de_ciutat_ess_ocupacio_barris_252x228_2.jpg?itok=ldQk8PO-", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90559, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139460, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76426, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15566, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7146, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=5zXDhz&url=https%3A%2F%2Fwww.barcelona.cat%2Fen%2Fgetinvolved", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 15, "urgency": "medium", "transferBytes": 1748335, "estimatedRedundantBytes": 147739, "redundancyRatio": 0.08450268398218877, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 83335, "displayValue": "Est savings of 81 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 64404, "displayValue": "Est savings of 63 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 83335, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 64404, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 16, "urgency": "medium", "totalTransferBytes": 1748335, "heavyRequestCount": 5, "heavyBytes": 387294, "heavyRatio": 0.22152161914049653, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_petit/public/foment_de_ciutat_ess_ocupacio_barris_252x228_2.jpg?itok=ldQk8PO-", "transferSize": 113438, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90559, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76426, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54920, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_qDD4BCxE8K-iT7MRORwp32v03DlJblP9-xrYwOBWlQo.css?delta=5&language=en&theme=barcelonacat_theme&include=eJyFz8GOwyAMBNAfCuXQD0ID8SasiI2wSZu_X6RKXa3EqidbM-8y-O5sOIgt4Mwq6l_HoeYloiUqwkiwICe1lldSP3R3JlJG_5-p2MidmR5_ge10kI8iptZQQ1p5Br7A6YrynHVbkYji1K6SeZuJnMThvWsm5FFmsUofWVCwhvsnUJssMXEYrMG_v0BPo8YoS0XDNkbu6tfWK8rtN7l1rj2WrDuti15qdPgIpR8d6Z1O&tcut5n", "transferSize": 51951, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "font", "count": 2, "transferBytes": 145479 }, { "resourceType": "image", "count": 1, "transferBytes": 113438 }, { "resourceType": "script", "count": 1, "transferBytes": 76426 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 51951 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 4, "transferBytes": 310868 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76426 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 94774, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "medium", "estimatedSavingsBytes": 64404, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 113438, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_petit/public/foment_de_ciutat_ess_ocupacio_barris_252x228_2.jpg?itok=ldQk8PO-", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90559, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76426, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.08, "displayValue": "6.6 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 6.6 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 63 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 63 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 81 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 81 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 860 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 860 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 711 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 711 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 93 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 93 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,470 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,470 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.89, "displayValue": "3.5 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.5 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "1,423 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,423 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/en/living-in-bcn", "status": "ok", "finalUrl": "https://www.barcelona.cat/en/living-in-bcn", "performanceScore": 0.65, "bestPracticesScore": 1, "transferBytes": 2305144, "co2Grams": 0.8830577907216001, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "stylesheet", "requestCount": 1, "transferBytes": 24654, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": 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Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 5, "urgency": "medium", "transferBytes": 2305144, "css": { "unusedBytes": 83418, "ratio": 0.0361877609381453, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 54011, "duplicatedBytes": 0, "ratio": 0.023430640341774743, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 83418, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 54011, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 18, "urgency": "high", "transferBytes": 2305144, "estimatedDeferrableBytes": 251162, "renderBlockingMs": 1500, "breakdown": { "offscreenImageSavings": 113733, "unusedJavascriptSavings": 54011, "unusedCssSavings": 83418 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 113733, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 54011, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "high", "estimatedSavingsBytes": 83418, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1500, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 103831, "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_menu/public/nens_nenes_paola_1.jpg?itok=yIky6vCx", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing 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"listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7144, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=giqj5t&url=https%3A%2F%2Fwww.barcelona.cat%2Fen%2Fliving-in-bcn", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 13, "urgency": "medium", "transferBytes": 2305144, "estimatedRedundantBytes": 137429, "redundancyRatio": 0.05961840127992004, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 83418, "displayValue": "Est savings of 81 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 54011, "displayValue": "Est savings of 53 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 83418, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 54011, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 13, "urgency": "medium", "totalTransferBytes": 2305144, "heavyRequestCount": 5, "heavyBytes": 377680, "heavyRatio": 0.16384225887840412, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_menu/public/nens_nenes_paola_1.jpg?itok=yIky6vCx", "transferSize": 103831, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90560, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76425, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54921, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_qDD4BCxE8K-iT7MRORwp32v03DlJblP9-xrYwOBWlQo.css?delta=5&language=en&theme=barcelonacat_theme&include=eJyFz0FqxTAMBNALxd-LHsiMHTVxcSQjyenP7Wso_FJI6Upi5m0GH4MdB7EnnNXE4vcJ6HXJ0EJNGAWe5CTVupLFqUdwkTb7v0zHRuGs9Pkb-E4HxSzi5oqeysp34B1crizPu25rktGC-dUqb3eiFgl47boTJmNmycCW3v4DXWXJhdNkivj6Ej2dlNGWDsU21-wWVx0d7fGTPAb3kVu1ndbFLnM6YobRF2idlFA&tcut5n", "transferSize": 51943, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "font", "count": 2, "transferBytes": 145481 }, { "resourceType": "image", "count": 1, "transferBytes": 103831 }, { "resourceType": "script", "count": 1, "transferBytes": 76425 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 51943 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 4, "transferBytes": 301255 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 113733, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "medium", "estimatedSavingsBytes": 54011, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 103831, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_menu/public/nens_nenes_paola_1.jpg?itok=yIky6vCx", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90560, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76425, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.01, "displayValue": "8.7 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 8.7 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 53 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 53 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 81 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 81 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 1,316 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 1,316 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 1,027 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 1,027 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,500 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,500 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.87, "displayValue": "3.6 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.6 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0.5, "displayValue": "Est savings of 111 KiB", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 111 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "1,389 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,389 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). 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error region for invalid input.", "Provide meaningful autocomplete values to support browsers and assistive tooling." ] }, "reusedFromCache": true } ], "recommendations": [ { "title": "No explicit validation rule", "urgency": "medium", "detail": "1 unique form control signature(s) on this page include this issue." }, { "title": "No error messaging hook", "urgency": "medium", "detail": "1 unique form control signature(s) on this page include this issue." }, { "title": "Missing autocomplete for tooling support", "urgency": "medium", "detail": "1 unique form control signature(s) on this page include this issue." } ] }, "metadata": { "score": 25, "urgency": "low", "checks": { "hasTitle": true, "hasLang": true, "hasDescription": false, "hasCanonical": true, "hasOpenGraphCore": false, "hasTwitterCard": true, "hasViewport": true, "hasCharset": true, "hasValidStructuredData": true, "hasInvalidStructuredData": false }, "observed": { "title": "Pàgina exemple mapa sant jordi | Barcelona.cat | 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false, "horizontalOverflowOnTablet": false, "mobileSmallTapTargets": 33, "tabletSmallTapTargets": 31, "fixedWidthOffenders": 0, "oversizedMedia": 0, "scanErrors": 0 }, "perDevice": [ { "device": "mobile", "viewportWidth": 390, "viewportHeight": 844, "contentWidth": 390, "horizontalOverflowPx": 0, "hasHorizontalOverflow": false, "fixedWidthOffenders": 0, "smallTapTargets": 33, "oversizedMedia": 0 }, { "device": "tablet", "viewportWidth": 820, "viewportHeight": 1180, "contentWidth": 820, "horizontalOverflowPx": 0, "hasHorizontalOverflow": false, "fixedWidthOffenders": 0, "smallTapTargets": 31, "oversizedMedia": 0 } ], "recommendations": [ { "title": "Increase touch target sizes", "urgency": "high", "detail": "Ensure interactive controls are at least 44x44 CSS px. Detected 33 small targets on mobile and 31 on tablet." } ] }, "securityLight": { "score": 59, "urgency": "medium", "checks": { "isHttps": true, "hasHsts": false, "hasCsp": false, "hasXContentTypeOptions": true, "hasReferrerPolicy": false, "hasPermissionsPolicy": false, "exposesServerFingerprint": true, "externalScriptCount": 7, "externalScriptsWithoutIntegrity": 7, "vulnerableLibraryCount": 0 }, "observed": { "headers": { "cache-control": "max-age=300, public", "content-encoding": "gzip", "content-language": "en", "content-length": "9528", "content-type": "text/html; charset=UTF-8", "date": "Mon, 13 Apr 2026 22:43:37 GMT", "etag": "\"1776120217-gzip\"", "expires": "Sun, 19 Nov 1978 05:00:00 GMT", "last-modified": "Mon, 13 Apr 2026 22:43:37 GMT", "server": "nginx", "vary": "Cookie,Accept-Encoding", "via": "1.1 ca2190123e61f1744d1210c24c87c840.cloudfront.net (CloudFront)", "x-amz-cf-id": "iQ0-gZl9Ve-gwm6D3eXuf9i-oHi1iDEC331q1YYRecsAlUpUSrtLDA==", "x-amz-cf-pop": "IAD12-P5", "x-cache": "Miss from cloudfront", "x-content-type-options": "nosniff", "x-frame-options": "SAMEORIGIN", "x-generator": "Drupal 10 (https://www.drupal.org)" }, "vulnerableLibrariesAuditScore": null, "vulnerableLibraries": [] }, "recommendations": [ { "title": "Add a Content-Security-Policy header", "urgency": "high", "detail": "Add an appropriate CSP to reduce script injection and resource loading risk." }, { "title": "Enable Strict-Transport-Security", "urgency": "medium", "detail": "Set a Strict-Transport-Security header to enforce HTTPS on repeat visits." }, { "title": "Define a Referrer-Policy", "urgency": "low", "detail": "Set a referrer policy to reduce unnecessary URL data leakage." }, { "title": "Define a Permissions-Policy", "urgency": "low", "detail": "Restrict browser capabilities to only what the application needs." }, { "title": "Add SRI to external scripts", "urgency": "medium", "detail": "7 external script tag(s) are missing integrity attributes." } ] }, "expectedFiles": { "score": 25, "urgency": "low", "origin": "https://www.barcelona.cat", "checks": [ { "path": "/robots.txt", "kind": "expected", "url": "https://www.barcelona.cat/robots.txt", "found": true, "status": 200, "contentType": "text/plain" }, { "path": "/sitemap.xml", "kind": "beneficial", "url": "https://www.barcelona.cat/sitemap.xml", "found": true, "status": 200, "contentType": "application/xml; charset=utf-8" }, { "path": "/.well-known/security.txt", "kind": "beneficial", "url": "https://www.barcelona.cat/.well-known/security.txt", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/manifest.webmanifest", "kind": "beneficial", "url": "https://www.barcelona.cat/manifest.webmanifest", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/favicon.ico", "kind": "beneficial", "url": "https://www.barcelona.cat/favicon.ico", "found": true, "status": 200, "contentType": "image/x-icon" } ], "recommendations": [ { "title": "Add beneficial discoverability and maintenance files", "urgency": "low", "detail": "Missing beneficial file(s): /.well-known/security.txt, /manifest.webmanifest." } ] }, "mediaHints": { "score": 50, "urgency": "medium", "checks": { "hasDarkMode": false, "hasMetaColorScheme": false, "hasDarkModeQuery": false, "autoplayingMedia": [], "autoplayCount": 0, "unmutedAutoplayCount": 0, "totalImages": 11, "imagesWithLazy": 0, "imagesWithoutLazy": 11 }, "recommendations": [ { "title": "Add dark mode support", "urgency": "medium", "detail": "No prefers-color-scheme: dark media query or color-scheme meta tag was found. Dark mode reduces energy use on OLED screens and improves user choice." }, { "title": "Add loading=\"lazy\" to images", "urgency": "high", "detail": "11 of 11 image(s) lack an explicit loading=\"lazy\" attribute. Lazy loading defers below-fold images and reduces initial page weight." } ] }, "wsgCustom": { "score": 85, "urgency": "medium", "data": { "hasPrintStyles": true, "hasReducedMotion": true, "media": { "totalImages": 16, "lazyImages": 1, "totalIframes": 2, "lazyIframes": 0 }, "typography": { "primaryFont": "\"Source Sans Pro\", \"Helvetica Neue\", Helvetica, Arial, sans-serif", "usesSystemFont": true }, "tracking": { "count": 0, "scripts": [] }, "semantics": { "hasNavigation": true, "hasMainContent": true } }, "recommendations": [ { "guideline": "11.3", "title": "Incomplete media lazy loading", "urgency": "medium", "detail": "Only 1/16 images use loading=\"lazy\". Global lazy loading reduces initial data transfer and energy consumption.", "wsid": "11.lazy loading", "assessor": "script", "example": "\"Description\"\n\n" }, { "guideline": "2.4", "title": "Review User Journey Efficiency", "urgency": "investigate", "detail": "Have a human walk through the main user journeys and verify they require the fewest steps possible. Unnecessary steps waste user time and device energy. Look for redundant confirmations, forced account creation, and non-essential interstitials.", "wsid": "2.minimize non-essential content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#minimize-non-essential-content-interactivity-or-journeys", "assessor": "human" }, { "guideline": "2.6", "title": "Check for Engagement Traps", "urgency": "investigate", "detail": "Manually review the page for patterns that artificially prolong engagement: infinite scroll, autoplay carousels, sticky overlays, and notification permission prompts. These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human" }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human" }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 17, "urgency": "low", "totalEstimatedSavingsBytes": 130442.55, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "medium", "estimatedSavingsBytes": 72410.55, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "medium", "estimatedSavingsBytes": 58032, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 331913.55, "totalEstimatedBlockingMs": 1482, "opportunities": [ { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1482, "displayValue": "Est savings of 1,480 ms", "urgency": "high", "sourceAuditId": "render-blocking-resources" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 87109, "estimatedBlockingMs": 0, "displayValue": "Est savings of 85 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 81881, "estimatedBlockingMs": 0, "displayValue": "Est savings of 80 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 72410.55, "estimatedBlockingMs": 0, "displayValue": "Est savings of 71 KiB", "urgency": "medium", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 58032, "estimatedBlockingMs": 0, "displayValue": "Est savings of 57 KiB", "urgency": "medium", "sourceAuditId": "uses-optimized-images" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 32481, "estimatedBlockingMs": 0, "displayValue": "Est savings of 32 KiB", "urgency": "low", "sourceAuditId": "unused-javascript" } ], "recommendations": [ { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1482 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 79.96 KB." }, { "title": "Serve images in next-gen formats", "urgency": "medium", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 70.71 KB." }, { "title": "Compress oversized image assets", "urgency": "medium", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 56.67 KB." }, { "title": "Remove unused JavaScript", "urgency": "low", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 31.72 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 167994.5582053073 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 8, "urgency": "medium", "transferBytes": 755614, "css": { "unusedBytes": 81881, "ratio": 0.10836352952698071, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 32481, "duplicatedBytes": 0, "ratio": 0.042986233711921694, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 81881, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 22, "urgency": "high", "transferBytes": 755614, "estimatedDeferrableBytes": 201471, "renderBlockingMs": 1482, "breakdown": { "offscreenImageSavings": 87109, "unusedJavascriptSavings": 32481, "unusedCssSavings": 81881 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 87109, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "medium", "estimatedSavingsBytes": 81881, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1482, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90560, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 84136, "url": "https://www.barcelona.cat/themes/barcelonacat_theme/images/menu/viula.jpg", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy script from cdn.matomo.cloud", "area": "script", "urgency": "medium", "estimatedSavingsBytes": 76426, "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139458, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76426, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15566, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7144, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=2uz7JE&url=https%3A%2F%2Fwww.barcelona.cat%2Fen%2Fpagina-exemple-mapa-sant-jordi", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 18, "urgency": "low", "transferBytes": 755614, "estimatedRedundantBytes": 114362, "redundancyRatio": 0.1513497632389024, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 81881, "displayValue": "Est savings of 80 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 32481, "displayValue": "Est savings of 32 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 81881, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 22, "urgency": "medium", "totalTransferBytes": 755614, "heavyRequestCount": 4, "heavyBytes": 271009, "heavyRatio": 0.3586606388976382, "heavyRequests": [ { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90560, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76426, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54920, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_evpTRQTawGYS1Ro7RbXq3hBxwat7AU-RJm1V8ZgzeaE.css?delta=5&language=en&theme=barcelonacat_theme&include=eJyFzkEKwzAMBMAPxfjQB5m1I1IXRzKSkja_r6EQKKT0pGV3DsJjY8dK7Al7NbH4OQG9ThlaqAmjwJPspFpnsjj0Flykjf2X6Vgo7JWe38DvtFLMIm6u6KnMfAWWJhktmB-t8nIlapGA8_crYbKNLhnY0u0f6CpTLpwGU8QzJXo5KaNNdpjTGjOM3gg5eRY&tcut5n", "transferSize": 49103, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "font", "count": 2, "transferBytes": 145480 }, { "resourceType": "script", "count": 1, "transferBytes": 76426 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 49103 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 3, "transferBytes": 194583 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76426 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 87109, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90560, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76426, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.13, "displayValue": "6.0 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 6.0 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 80 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 80 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 71 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 71 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 57 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 57 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 85 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 85 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,480 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,480 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.87, "displayValue": "3.6 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.6 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0.5, "displayValue": "Est savings of 32 KiB", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 32 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "891 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 891 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). 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Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 2650787.8, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 1442164.7999999996, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "estimatedSavingsBytes": 1208623, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.38 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.15 MB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 2875846.8, "totalEstimatedBlockingMs": 1648, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 1442164.7999999996, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,408 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 1208623, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,180 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1648, "displayValue": "Est savings of 1,650 ms", "urgency": "high", "sourceAuditId": "render-blocking-resources" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 87108, "estimatedBlockingMs": 0, "displayValue": "Est savings of 85 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 83326, "estimatedBlockingMs": 0, "displayValue": "Est savings of 81 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 54625, "estimatedBlockingMs": 0, "displayValue": "Est savings of 53 KiB", "urgency": "medium", "sourceAuditId": "unused-javascript" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.38 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.15 MB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1648 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 81.37 KB." }, { "title": "Remove unused JavaScript", "urgency": "medium", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 53.34 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 168006.7584846369 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.07 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.07 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 7, "urgency": "medium", "transferBytes": 2436051, "css": { "unusedBytes": 83326, "ratio": 0.034205359411605095, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 54625, "duplicatedBytes": 0, "ratio": 0.02242358636990769, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.25, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 83326, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 54625, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 18, "urgency": "high", "transferBytes": 2436051, "estimatedDeferrableBytes": 225059, "renderBlockingMs": 1648, "breakdown": { "offscreenImageSavings": 87108, "unusedJavascriptSavings": 54625, "unusedCssSavings": 83326 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 87108, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 54625, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "high", "estimatedSavingsBytes": 83326, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1648, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 131590, "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_paginat/public/banner_05_1.jpg?itok=JKDuuKQG", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139458, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15566, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7146, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2860, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=oBcwvV&url=https%3A%2F%2Fwww.barcelona.cat%2Fen%2Fwhat-to-do-in-bcn", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 23, "urgency": "medium", "transferBytes": 2436051, "estimatedRedundantBytes": 137951, "redundancyRatio": 0.056628945781512785, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 83326, "displayValue": "Est savings of 81 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 54625, "displayValue": "Est savings of 53 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 83326, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 54625, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 21, "urgency": "high", "totalTransferBytes": 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"image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90561, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76425, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54920, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": 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{ "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 87108, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "medium", "estimatedSavingsBytes": 54625, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 131590, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_paginat/public/banner_05_1.jpg?itok=JKDuuKQG", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.03, "displayValue": "7.9 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 7.9 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 53 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 53 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 81 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 81 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 1,408 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 1,408 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 1,180 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 1,180 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 85 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 85 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,650 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,650 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0, "displayValue": "1,470 elements", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,470 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.81, "displayValue": "4.0 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 4.0 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/es/conocebcn", "status": "ok", "finalUrl": "https://www.barcelona.cat/es/conocebcn", "performanceScore": 0.67, "bestPracticesScore": 1, "transferBytes": 1961551, "co2Grams": 0.7514337032514001, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, 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"id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 18, "urgency": "high", "transferBytes": 1961551, "estimatedDeferrableBytes": 221321, "renderBlockingMs": 1638, "breakdown": { "offscreenImageSavings": 83661, "unusedJavascriptSavings": 54011, "unusedCssSavings": 83649 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 54011, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external 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null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=61RRZg&url=https%3A%2F%2Fwww.barcelona.cat%2Fes%2Fconocebcn", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 14, "urgency": "medium", "transferBytes": 1961551, "estimatedRedundantBytes": 137660, "redundancyRatio": 0.07017915924694285, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 83649, "displayValue": "Est savings of 82 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 54011, "displayValue": "Est savings of 53 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 83649, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 54011, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 33, "urgency": "high", "totalTransferBytes": 1961551, "heavyRequestCount": 9, "heavyBytes": 1128139, "heavyRatio": 0.5751260099788382, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_gran/public/destacat-cultura%20popular4071.jpg?itok=cA32eUx7", "transferSize": 261357, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_gran/public/dues-nenes-conversen-assegudes-als-bancs_528x228px_2.jpg?itok=bx8tHvwg", "transferSize": 181501, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_gran/public/biblioteca2_528x228.jpg?itok=M55yvOgb", "transferSize": 156163, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_gran/public/llibreria_528x228_0.jpg?itok=KJ5nOJh0", "transferSize": 142303, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_menu/public/memoria_tradicio.jpg?itok=j2Tlac4l", "transferSize": 112975, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90560, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76425, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54920, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_qDD4BCxE8K-iT7MRORwp32v03DlJblP9-xrYwOBWlQo.css?delta=5&language=es&theme=barcelonacat_theme&include=eJyFz0FqxTAMBNALxd-LHsiMHTVxcSQjyenP7Wso_FJI6Upi5m0GH4MdB7EnnNXE4vcJ6HXJ0EJNGAWe5CTVupLFqUdwkTb7v0zHRuGs9Pkb-E4HxSzi5oqeysp34B1crizPu25rktGC-dUqb3eiFgl47boTJmNmycCW3v4DXWXJhdNkivj6Ej2dlNGWDsU21-wWVx0d7fGTPAb3kVu1ndbFLnM6YobRF2idlFA&tcut5n", "transferSize": 51935, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "image", "count": 5, "transferBytes": 854299 }, { "resourceType": "font", "count": 2, "transferBytes": 145480 }, { "resourceType": "script", "count": 1, "transferBytes": 76425 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 51935 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 8, "transferBytes": 1051714 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "medium", "estimatedSavingsBytes": 54011, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 261357, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_gran/public/destacat-cultura%20popular4071.jpg?itok=cA32eUx7", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.05, "displayValue": "7.1 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 7.1 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 53 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 53 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 82 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 82 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 1,013 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 1,013 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 833 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 833 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 82 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 82 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,640 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,640 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.87, "displayValue": "3.6 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.6 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "1,080 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,080 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). 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"urgency": "low", "detail": "Core machine-readable metadata is present and no structural issues were detected." } ] }, "layoutAdaptation": { "score": 30, "urgency": "medium", "checks": { "testedMobile": true, "testedTablet": true, "horizontalOverflowOnMobile": false, "horizontalOverflowOnTablet": false, "mobileSmallTapTargets": 33, "tabletSmallTapTargets": 31, "fixedWidthOffenders": 0, "oversizedMedia": 0, "scanErrors": 0 }, "perDevice": [ { "device": "mobile", "viewportWidth": 390, "viewportHeight": 844, "contentWidth": 390, "horizontalOverflowPx": 0, "hasHorizontalOverflow": false, "fixedWidthOffenders": 0, "smallTapTargets": 33, "oversizedMedia": 0 }, { "device": "tablet", "viewportWidth": 820, "viewportHeight": 1180, "contentWidth": 820, "horizontalOverflowPx": 0, "hasHorizontalOverflow": false, "fixedWidthOffenders": 0, "smallTapTargets": 31, "oversizedMedia": 0 } ], "recommendations": [ { "title": "Increase touch target sizes", "urgency": "high", "detail": "Ensure interactive controls are at least 44x44 CSS px. Detected 33 small targets on mobile and 31 on tablet." } ] }, "securityLight": { "score": 59, "urgency": "medium", "checks": { "isHttps": true, "hasHsts": false, "hasCsp": false, "hasXContentTypeOptions": true, "hasReferrerPolicy": false, "hasPermissionsPolicy": false, "exposesServerFingerprint": true, "externalScriptCount": 7, "externalScriptsWithoutIntegrity": 7, "vulnerableLibraryCount": 0 }, "observed": { "headers": { "cache-control": "max-age=300, public", "content-encoding": "gzip", "content-language": "es", "content-length": "9792", "content-type": "text/html; charset=UTF-8", "date": "Mon, 13 Apr 2026 22:44:19 GMT", "etag": "\"1776120258-gzip\"", "expires": "Sun, 19 Nov 1978 05:00:00 GMT", "last-modified": "Mon, 13 Apr 2026 22:44:18 GMT", "server": "nginx", "vary": "Cookie,Accept-Encoding", "via": "1.1 ca2190123e61f1744d1210c24c87c840.cloudfront.net (CloudFront)", "x-amz-cf-id": "5HpZiczrZ2zJUYNxyaKnueNJAHUNJW0lMszi7eOa17FV8p_9rEFx5g==", "x-amz-cf-pop": "IAD12-P5", "x-cache": "Miss from cloudfront", "x-content-type-options": "nosniff", "x-frame-options": "SAMEORIGIN", "x-generator": "Drupal 10 (https://www.drupal.org)" }, "vulnerableLibrariesAuditScore": null, "vulnerableLibraries": [] }, "recommendations": [ { "title": "Add a Content-Security-Policy header", "urgency": "high", "detail": "Add an appropriate CSP to reduce script injection and resource loading risk." }, { "title": "Enable Strict-Transport-Security", "urgency": "medium", "detail": "Set a Strict-Transport-Security header to enforce HTTPS on repeat visits." }, { "title": "Define a Referrer-Policy", "urgency": "low", "detail": "Set a referrer policy to reduce unnecessary URL data leakage." }, { "title": "Define a Permissions-Policy", "urgency": "low", "detail": "Restrict browser capabilities to only what the application needs." }, { "title": "Add SRI to external scripts", "urgency": "medium", "detail": "7 external script tag(s) are missing integrity attributes." } ] }, "expectedFiles": { "score": 25, "urgency": "low", "origin": "https://www.barcelona.cat", "checks": [ { "path": "/robots.txt", "kind": "expected", "url": "https://www.barcelona.cat/robots.txt", "found": true, "status": 200, "contentType": "text/plain" }, { "path": "/sitemap.xml", "kind": "beneficial", "url": "https://www.barcelona.cat/sitemap.xml", "found": true, "status": 200, "contentType": "application/xml; charset=utf-8" }, { "path": "/.well-known/security.txt", "kind": "beneficial", "url": "https://www.barcelona.cat/.well-known/security.txt", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/manifest.webmanifest", "kind": "beneficial", "url": "https://www.barcelona.cat/manifest.webmanifest", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/favicon.ico", "kind": "beneficial", "url": "https://www.barcelona.cat/favicon.ico", "found": true, "status": 200, "contentType": "image/x-icon" } ], "recommendations": [ { "title": "Add beneficial discoverability and maintenance files", "urgency": "low", "detail": "Missing beneficial file(s): /.well-known/security.txt, /manifest.webmanifest." } ] }, "mediaHints": { "score": 45, "urgency": "medium", "checks": { "hasDarkMode": false, "hasMetaColorScheme": false, "hasDarkModeQuery": false, "autoplayingMedia": [], "autoplayCount": 0, "unmutedAutoplayCount": 0, "totalImages": 12, "imagesWithLazy": 1, "imagesWithoutLazy": 11 }, "recommendations": [ { "title": "Add dark mode support", "urgency": "medium", "detail": "No prefers-color-scheme: dark media query or color-scheme meta tag was found. Dark mode reduces energy use on OLED screens and improves user choice." }, { "title": "Add loading=\"lazy\" to images", "urgency": "high", "detail": "11 of 12 image(s) lack an explicit loading=\"lazy\" attribute. Lazy loading defers below-fold images and reduces initial page weight." } ] }, "wsgCustom": { "score": 85, "urgency": "medium", "data": { "hasPrintStyles": true, "hasReducedMotion": true, "media": { "totalImages": 17, "lazyImages": 2, "totalIframes": 1, "lazyIframes": 0 }, "typography": { "primaryFont": "\"Source Sans Pro\", \"Helvetica Neue\", Helvetica, Arial, sans-serif", "usesSystemFont": true }, "tracking": { "count": 0, "scripts": [] }, "semantics": { "hasNavigation": true, "hasMainContent": true } }, "recommendations": [ { "guideline": "11.3", "title": "Incomplete media lazy loading", "urgency": "medium", "detail": "Only 2/17 images use loading=\"lazy\". Global lazy loading reduces initial data transfer and energy consumption.", "wsid": "11.lazy loading", "assessor": "script", "example": "\"Description\"\n\n" }, { "guideline": "2.4", "title": "Review User Journey Efficiency", "urgency": "investigate", "detail": "Have a human walk through the main user journeys and verify they require the fewest steps possible. Unnecessary steps waste user time and device energy. Look for redundant confirmations, forced account creation, and non-essential interstitials.", "wsid": "2.minimize non-essential content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#minimize-non-essential-content-interactivity-or-journeys", "assessor": "human" }, { "guideline": "2.6", "title": "Check for Engagement Traps", "urgency": "investigate", "detail": "Manually review the page for patterns that artificially prolong engagement: infinite scroll, autoplay carousels, sticky overlays, and notification permission prompts. These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human" }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human" }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 22, "urgency": "low", "totalEstimatedSavingsBytes": 187330.25, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "medium", "estimatedSavingsBytes": 129298.25, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "medium", "estimatedSavingsBytes": 58032, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 126.27 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 385340.25, "totalEstimatedBlockingMs": 882, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 129298.25, "estimatedBlockingMs": 0, "displayValue": "Est savings of 126 KiB", "urgency": "medium", "sourceAuditId": "modern-image-formats" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 83661, "estimatedBlockingMs": 0, "displayValue": "Est savings of 82 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 81868, "estimatedBlockingMs": 0, "displayValue": "Est savings of 80 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 58032, "estimatedBlockingMs": 0, "displayValue": "Est savings of 57 KiB", "urgency": "medium", "sourceAuditId": "uses-optimized-images" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 882, "displayValue": "Est savings of 880 ms", "urgency": "medium", "sourceAuditId": "render-blocking-resources" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 32481, "estimatedBlockingMs": 0, "displayValue": "Est savings of 32 KiB", "urgency": "low", "sourceAuditId": "unused-javascript" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "medium", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 126.27 KB." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 81.70 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 79.95 KB." }, { "title": "Compress oversized image assets", "urgency": "medium", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 56.67 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "medium", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 882 ms." }, { "title": "Remove unused JavaScript", "urgency": "low", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 31.72 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 167996.6522346369 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 8, "urgency": "medium", "transferBytes": 851607, "css": { "unusedBytes": 81868, "ratio": 0.09613354516813506, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 32481, "duplicatedBytes": 0, "ratio": 0.03814083256713484, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 81868, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 15, "urgency": "medium", "transferBytes": 851607, "estimatedDeferrableBytes": 198010, "renderBlockingMs": 882, "breakdown": { "offscreenImageSavings": 83661, "unusedJavascriptSavings": 32481, "unusedCssSavings": 81868 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "medium", "estimatedSavingsBytes": 81868, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "medium", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 882, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90561, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 84135, "url": "https://www.barcelona.cat/themes/barcelonacat_theme/images/menu/viula.jpg", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy script from cdn.matomo.cloud", "area": "script", "urgency": "medium", "estimatedSavingsBytes": 76425, "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139457, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": 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"https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15565, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7145, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=kzTRMD&url=https%3A%2F%2Fwww.barcelona.cat%2Fes%2Fdiada-nacional-de-cataluna-2022", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 17, "urgency": "low", "transferBytes": 851607, "estimatedRedundantBytes": 114349, "redundancyRatio": 0.1342743777352699, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 81868, "displayValue": "Est savings of 80 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 32481, "displayValue": "Est savings of 32 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 81868, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 19, "urgency": "medium", "totalTransferBytes": 851607, "heavyRequestCount": 4, "heavyBytes": 271012, "heavyRatio": 0.318235993832836, "heavyRequests": [ { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90561, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76425, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54920, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_evpTRQTawGYS1Ro7RbXq3hBxwat7AU-RJm1V8ZgzeaE.css?delta=5&language=es&theme=barcelonacat_theme&include=eJyFzkEKwzAMBMAPxfjQB5m1I1IXRzKSkja_r6EQKKT0pGV3DsJjY8dK7Al7NbH4OQG9ThlaqAmjwJPspFpnsjj0Flykjf2X6Vgo7JWe38DvtFLMIm6u6KnMfAWWJhktmB-t8nIlapGA8_crYbKNLhnY0u0f6CpTLpwGU8QzJXo5KaNNdpjTGjOM3gg5eRY&tcut5n", "transferSize": 49106, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "font", "count": 2, "transferBytes": 145481 }, { "resourceType": "script", "count": 1, "transferBytes": 76425 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 49106 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 3, "transferBytes": 194587 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "medium", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90561, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76425, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.03, "displayValue": "7.8 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 7.8 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 32 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 32 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 80 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 80 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 126 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 126 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 57 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 57 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 82 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 82 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 880 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 880 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "server-response-time", "title": "Reduce initial server response time", "description": "Keep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).", "score": 0, "displayValue": "Root document took 640 ms", "impact": "high", "wsg": { "categoryId": "4", "categoryName": "Hosting, Infrastructure, and Systems", "id": "11", "title": "Ensure infrastructure fits project requirements", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements", "subheading": "Maintain the infrastructure you require rather than over-provisioning. Autoscale to meet demand and preserve hardware resources." }, "assessor": "script", "issueTemplate": "## Improve Reduce initial server response time\n\n- Lighthouse audit: server-response-time\n- Current value: Root document took 640 ms\n- WSG guideline: 11 Ensure infrastructure fits project requirements\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements\n\n### Why this matters\nKeep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.76, "displayValue": "4.3 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 4.3 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "916 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 916 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). 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Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 88, "urgency": "high", "totalEstimatedSavingsBytes": 1511005.6, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 828099.6, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "estimatedSavingsBytes": 682906, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 808.69 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 666.90 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 1741756.6, "totalEstimatedBlockingMs": 1957, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 828099.6, "estimatedBlockingMs": 0, "displayValue": "Est savings of 809 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 682906, "estimatedBlockingMs": 0, "displayValue": "Est savings of 667 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1957, "displayValue": "Est savings of 1,960 ms", "urgency": "high", "sourceAuditId": "render-blocking-resources" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 83661, "estimatedBlockingMs": 0, "displayValue": "Est savings of 82 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 83301, "estimatedBlockingMs": 0, "displayValue": "Est savings of 81 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 63789, "estimatedBlockingMs": 0, "displayValue": "Est savings of 62 KiB", "urgency": "medium", "sourceAuditId": "unused-javascript" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 808.69 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 666.90 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1957 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 81.70 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 81.35 KB." }, { "title": "Remove unused JavaScript", "urgency": "medium", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 62.29 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 168020.9332053073 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.08 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.08 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 8, "urgency": "medium", "transferBytes": 1707522, "css": { "unusedBytes": 83301, "ratio": 0.048784730152817944, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 63789, "duplicatedBytes": 0, "ratio": 0.03735764458671689, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.25, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 83301, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 63789, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 19, "urgency": "high", "transferBytes": 1707522, "estimatedDeferrableBytes": 230751, "renderBlockingMs": 1957, "breakdown": { "offscreenImageSavings": 83661, "unusedJavascriptSavings": 63789, "unusedCssSavings": 83301 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 63789, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "high", "estimatedSavingsBytes": 83301, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1957, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 113410, "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_petit/public/foment_de_ciutat_ess_ocupacio_barris_252x228_3.jpg?itok=2zKuqIvu", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90559, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139463, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76426, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15565, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7151, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2860, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=E9epT2&url=https%3A%2F%2Fwww.barcelona.cat%2Fes%2Fimplicate", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 25, "urgency": "medium", "transferBytes": 1707522, "estimatedRedundantBytes": 147090, "redundancyRatio": 0.08614237473953483, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 83301, "displayValue": "Est savings of 81 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 63789, "displayValue": "Est savings of 62 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 83301, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 63789, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 16, "urgency": "medium", "totalTransferBytes": 1707522, "heavyRequestCount": 5, "heavyBytes": 387251, "heavyRatio": 0.22679122143082198, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_petit/public/foment_de_ciutat_ess_ocupacio_barris_252x228_3.jpg?itok=2zKuqIvu", "transferSize": 113410, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90559, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76426, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54920, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_qDD4BCxE8K-iT7MRORwp32v03DlJblP9-xrYwOBWlQo.css?delta=5&language=es&theme=barcelonacat_theme&include=eJyFz8GOwyAMBNAfCuXQD0ID8SasiI2wSZu_X6RKXa3EqidbM-8y-O5sOIgt4Mwq6l_HoeYloiUqwkiwICe1lldSP3R3JlJG_5-p2MidmR5_ge10kI8iptZQQ1p5Br7A6YrynHVbkYji1K6SeZuJnMThvWsm5FFmsUofWVCwhvsnUJssMXEYrMG_v0BPo8YoS0XDNkbu6tfWK8rtN7l1rj2WrDuti15qdPgIpR8d6Z1O&tcut5n", "transferSize": 51936, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "font", "count": 2, "transferBytes": 145479 }, { "resourceType": "image", "count": 1, "transferBytes": 113410 }, { "resourceType": "script", "count": 1, "transferBytes": 76426 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 51936 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 4, "transferBytes": 310825 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76426 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "medium", "estimatedSavingsBytes": 63789, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 113410, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_petit/public/foment_de_ciutat_ess_ocupacio_barris_252x228_3.jpg?itok=2zKuqIvu", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90559, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76426, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.04, "displayValue": "7.5 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 7.5 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 62 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 62 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 81 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 81 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 809 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 809 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 667 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 667 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 82 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 82 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,960 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,960 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0, "displayValue": "1,443 elements", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,443 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.82, "displayValue": "3.9 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.9 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/es/que-hacer-en-bcn", "status": "ok", "finalUrl": "https://www.barcelona.cat/es/que-hacer-en-bcn", "performanceScore": 0.59, "bestPracticesScore": 1, "transferBytes": 2393048, "co2Grams": 0.9167321781072001, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "stylesheet", "requestCount": 1, "transferBytes": 24654, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": 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Estimated byte savings: 53.35 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 168015.1459846369 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.08 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.08 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 7, "urgency": "medium", "transferBytes": 2393048, "css": { "unusedBytes": 83310, "ratio": 0.034813342649207206, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 54632, "duplicatedBytes": 0, "ratio": 0.022829462676887385, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.25, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 83310, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 54632, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 17, "urgency": "high", "transferBytes": 2393048, "estimatedDeferrableBytes": 221603, "renderBlockingMs": 1477, "breakdown": { "offscreenImageSavings": 83661, "unusedJavascriptSavings": 54632, "unusedCssSavings": 83310 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 54632, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "high", "estimatedSavingsBytes": 83310, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1477, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 131570, "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_paginat/public/banner_05_2.jpg?itok=v2FZuICQ", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139476, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, "sampleUrl": 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"listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7163, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=0RfsCL&url=https%3A%2F%2Fwww.barcelona.cat%2Fes%2Fque-hacer-en-bcn", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 23, "urgency": "medium", "transferBytes": 2393048, "estimatedRedundantBytes": 137942, "redundancyRatio": 0.05764280532609459, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 83310, "displayValue": "Est savings of 81 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 54632, "displayValue": "Est savings of 53 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 83310, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 54632, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 21, "urgency": "high", "totalTransferBytes": 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"https://www.barcelona.cat/sites/default/files/css/css_qDD4BCxE8K-iT7MRORwp32v03DlJblP9-xrYwOBWlQo.css?delta=6&language=es&theme=barcelonacat_theme&include=eJyFz8FuxCAMBNAfCsuhH4QG4ia0DkbYpJu_L9JKW1VitSdbM-8y-OrFcFCxgDOrqH8ch5qXiJaIpSDBgpzUWl5J_dDdmQiP_pWp2MidmX7-A9vpIB9FTK2hhrSWGfhESVeU-6zbWCLYqV2cyzYTOYnDc9dMKOf07ZASqebINDXSRxYURcPHO1CbLDGVMFiDf36B7katgJeKhm0s3tWvrVfw7S-59VJ75Kw7rYteanT4CKVfKxCiTQ&tcut5n", "transferSize": 51935, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "image", "count": 4, "transferBytes": 454618 }, { "resourceType": "font", "count": 2, "transferBytes": 145479 }, { "resourceType": "script", "count": 1, "transferBytes": 76425 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 51935 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 7, "transferBytes": 652032 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 83661, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "medium", "estimatedSavingsBytes": 54632, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 131570, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_paginat/public/banner_05_2.jpg?itok=v2FZuICQ", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.01, "displayValue": "9.0 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 9.0 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 53 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 53 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 81 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 81 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 1,348 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 1,348 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 1,130 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 1,130 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 82 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 82 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,480 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,480 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0, "displayValue": "1,493 elements", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,493 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.82, "displayValue": "3.9 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.9 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/es/trabajo-y-empresa", "status": "ok", "finalUrl": "https://www.barcelona.cat/es/trabajo-y-empresa", "performanceScore": 0.67, "bestPracticesScore": 1, "transferBytes": 3221177, "co2Grams": 1.2339729948078002, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, 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"externalOriginCount": 10, "greenCount": 4, "notGreenCount": 7, "unknownCount": 0 } }, "formValidation": { "score": 60, "urgency": "high", "pageElementOccurrences": 1, "uniqueElementsAssessed": 1, "reusedFromCacheCount": 1, "components": [ { "signature": "form|get|/es/|input|text|query|no-autocomplete|optional|no-pattern|no-minlength", "role": "form", "controlType": "text", "fieldName": "query", "formContext": "form|get|/es/", "hasLabel": true, "hasValidationRule": false, "hasErrorMessagingHook": false, "toolingFriendly": false, "assessment": { "score": 60, "urgency": "high", "issues": [ "No explicit validation rule", "No error messaging hook", "Missing autocomplete for tooling support" ], "recommendations": [ "Define validation constraints (required, pattern, min/max, or semantic input type).", "Add aria-errormessage/aria-describedby and a visible error region for invalid input.", "Provide meaningful autocomplete values to support browsers and assistive tooling." ] }, "reusedFromCache": true } ], "recommendations": [ { "title": "No explicit validation rule", "urgency": "medium", "detail": "1 unique form control signature(s) on this page include this issue." }, { "title": "No error messaging hook", "urgency": "medium", "detail": "1 unique form control signature(s) on this page include this issue." }, { "title": "Missing autocomplete for tooling support", "urgency": "medium", "detail": "1 unique form control signature(s) on this page include this issue." } ] }, "metadata": { "score": 0, "urgency": "low", "checks": { "hasTitle": true, "hasLang": true, "hasDescription": true, "hasCanonical": true, "hasOpenGraphCore": true, "hasTwitterCard": true, "hasViewport": true, "hasCharset": true, "hasValidStructuredData": true, "hasInvalidStructuredData": false }, "observed": { "title": "Trabajo y empresa | Barcelona.cat | Ayuntamiento de Barcelona", "lang": "es", "charset": "utf-8", "viewport": "width=device-width, initial-scale=1, shrink-to-fit=no", "description": "Encuentra toda la información, servicios y ayudas para buscar trabajo, emprender un negocio o hacer crecer tu empresa en Barcelona.", "robots": "", "canonical": "https://www.barcelona.cat/es/trabajo-y-empresa", "ogTitle": "Trabajo y empresa en Barcelona", "ogDescription": "¿Estás buscando trabajo o quieres emprender? 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Detected 96 small targets on mobile and 94 on tablet." } ] }, "securityLight": { "score": 59, "urgency": "medium", "checks": { "isHttps": true, "hasHsts": false, "hasCsp": false, "hasXContentTypeOptions": true, "hasReferrerPolicy": false, "hasPermissionsPolicy": false, "exposesServerFingerprint": true, "externalScriptCount": 7, "externalScriptsWithoutIntegrity": 7, "vulnerableLibraryCount": 0 }, "observed": { "headers": { "cache-control": "max-age=300, public", "content-encoding": "gzip", "content-language": "es", "content-length": "17852", "content-type": "text/html; charset=UTF-8", "date": "Mon, 13 Apr 2026 22:45:02 GMT", "etag": "\"1776120302-gzip\"", "expires": "Sun, 19 Nov 1978 05:00:00 GMT", "last-modified": "Mon, 13 Apr 2026 22:45:02 GMT", "server": "nginx", "vary": "Cookie,Accept-Encoding", "via": "1.1 ca2190123e61f1744d1210c24c87c840.cloudfront.net (CloudFront)", "x-amz-cf-id": "ojlzW3s7UzcXkQRL_qtoPEwJ0oFK-Qsx-kFrg-RaD5smdPA_E87t8g==", "x-amz-cf-pop": "IAD12-P5", "x-cache": "Miss from cloudfront", "x-content-type-options": "nosniff", "x-frame-options": "SAMEORIGIN", "x-generator": "Drupal 10 (https://www.drupal.org)" }, "vulnerableLibrariesAuditScore": null, "vulnerableLibraries": [] }, "recommendations": [ { "title": "Add a Content-Security-Policy header", "urgency": "high", "detail": "Add an appropriate CSP to reduce script injection and resource loading risk." }, { "title": "Enable Strict-Transport-Security", "urgency": "medium", "detail": "Set a Strict-Transport-Security header to enforce HTTPS on repeat visits." }, { "title": "Define a Referrer-Policy", "urgency": "low", "detail": "Set a referrer policy to reduce unnecessary URL data leakage." }, { "title": "Define a Permissions-Policy", "urgency": "low", "detail": "Restrict browser capabilities to only what the application needs." }, { "title": "Add SRI to external scripts", "urgency": "medium", "detail": "7 external script tag(s) are missing integrity attributes." } ] }, "expectedFiles": { "score": 25, "urgency": "low", "origin": "https://www.barcelona.cat", "checks": [ { "path": "/robots.txt", "kind": "expected", "url": "https://www.barcelona.cat/robots.txt", "found": true, "status": 200, "contentType": "text/plain" }, { "path": "/sitemap.xml", "kind": "beneficial", "url": "https://www.barcelona.cat/sitemap.xml", "found": true, "status": 200, "contentType": "application/xml; charset=utf-8" }, { "path": "/.well-known/security.txt", "kind": "beneficial", "url": "https://www.barcelona.cat/.well-known/security.txt", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/manifest.webmanifest", "kind": "beneficial", "url": "https://www.barcelona.cat/manifest.webmanifest", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/favicon.ico", "kind": "beneficial", "url": "https://www.barcelona.cat/favicon.ico", "found": true, "status": 200, "contentType": "image/x-icon" } ], "recommendations": [ { "title": "Add beneficial discoverability and maintenance files", "urgency": "low", "detail": "Missing beneficial file(s): /.well-known/security.txt, /manifest.webmanifest." } ] }, "mediaHints": { "score": 20, "urgency": "low", "checks": { "hasDarkMode": false, "hasMetaColorScheme": false, "hasDarkModeQuery": false, "autoplayingMedia": [], "autoplayCount": 0, "unmutedAutoplayCount": 0, "totalImages": 48, "imagesWithLazy": 37, "imagesWithoutLazy": 11 }, "recommendations": [ { "title": "Add dark mode support", "urgency": "medium", "detail": "No prefers-color-scheme: dark media query or color-scheme meta tag was found. Dark mode reduces energy use on OLED screens and improves user choice." } ] }, "wsgCustom": { "score": 85, "urgency": "medium", "data": { "hasPrintStyles": true, "hasReducedMotion": true, "media": { "totalImages": 53, "lazyImages": 38, "totalIframes": 1, "lazyIframes": 0 }, "typography": { "primaryFont": "\"Source Sans Pro\", \"Helvetica Neue\", Helvetica, Arial, sans-serif", "usesSystemFont": true }, "tracking": { "count": 0, "scripts": [] }, "semantics": { "hasNavigation": true, "hasMainContent": true } }, "recommendations": [ { "guideline": "11.3", "title": "Incomplete media lazy loading", "urgency": "medium", "detail": "Only 38/53 images use loading=\"lazy\". Global lazy loading reduces initial data transfer and energy consumption.", "wsid": "11.lazy loading", "assessor": "script", "example": "\"Description\"\n\n" }, { "guideline": "2.4", "title": "Review User Journey Efficiency", "urgency": "investigate", "detail": "Have a human walk through the main user journeys and verify they require the fewest steps possible. Unnecessary steps waste user time and device energy. Look for redundant confirmations, forced account creation, and non-essential interstitials.", "wsid": "2.minimize non-essential content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#minimize-non-essential-content-interactivity-or-journeys", "assessor": "human" }, { "guideline": "2.6", "title": "Check for Engagement Traps", "urgency": "investigate", "detail": "Manually review the page for patterns that artificially prolong engagement: infinite scroll, autoplay carousels, sticky overlays, and notification permission prompts. These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human" }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human" }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 3957876.2, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 2146336.2, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "estimatedSavingsBytes": 1811540, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 2.05 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.73 MB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 4190838.2, "totalEstimatedBlockingMs": 1493, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 2146336.2, "estimatedBlockingMs": 0, "displayValue": "Est savings of 2,096 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 1811540, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,769 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1493, "displayValue": "Est savings of 1,490 ms", "urgency": "high", "sourceAuditId": "render-blocking-resources" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 91563, "estimatedBlockingMs": 0, "displayValue": "Est savings of 89 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 83327, "estimatedBlockingMs": 0, "displayValue": "Est savings of 81 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 58072, "estimatedBlockingMs": 0, "displayValue": "Est savings of 57 KiB", "urgency": "medium", "sourceAuditId": "unused-javascript" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 2.05 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.73 MB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1493 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 89.42 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 81.37 KB." }, { "title": "Remove unused JavaScript", "urgency": "medium", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 56.71 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 167992.89598463685 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 7, "urgency": "medium", "transferBytes": 3221177, "css": { "unusedBytes": 83327, "ratio": 0.025868494652730972, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 58072, "duplicatedBytes": 0, "ratio": 0.018028192800333544, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.25, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 83327, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 58072, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 17, "urgency": "high", "transferBytes": 3221177, "estimatedDeferrableBytes": 232962, "renderBlockingMs": 1493, "breakdown": { "offscreenImageSavings": 91563, "unusedJavascriptSavings": 58072, "unusedCssSavings": 83327 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 91563, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 58072, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external 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demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 158268, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_central/public/cerques_feina_mercat_laboral_0256_1.jpg?itok=7K0uL1Pt", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.06, "displayValue": "7.0 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 7.0 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 81 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 81 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 2,096 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 2,096 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 1,769 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 1,769 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 89 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 89 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,490 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,490 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0, "displayValue": "1,504 elements", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,504 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.81, "displayValue": "4.0 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 4.0 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0.5, "displayValue": "Est savings of 57 KiB", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 57 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "total-byte-weight", "title": "Avoid enormous network payloads", "description": "Large network payloads cost users real money and are highly correlated with long load times. [Learn how to reduce payload sizes](https://developer.chrome.com/docs/lighthouse/performance/total-byte-weight/).", "score": 0.5, "displayValue": "Total size was 3,146 KiB", "impact": "medium", "wsg": { "categoryId": "5", "categoryName": "Business Strategy And Product Management", "id": "25", "title": "Define performance and environmental budgets", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#define-performance-and-environmental-budgets", "subheading": "Set budgets, taking people, planet, and performance into account alongside baselines, targets, evidence, and resources to help meet KPIs." }, "assessor": "script", "issueTemplate": "## Improve Avoid enormous network payloads\n\n- Lighthouse audit: total-byte-weight\n- Current value: Total size was 3,146 KiB\n- WSG guideline: 25 Define performance and environmental budgets\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#define-performance-and-environmental-budgets\n\n### Why this matters\nLarge network payloads cost users real money and are highly correlated with long load times. 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Detected 37 small targets on mobile and 32 on tablet." } ] }, "securityLight": { "score": 59, "urgency": "medium", "checks": { "isHttps": true, "hasHsts": false, "hasCsp": false, "hasXContentTypeOptions": true, "hasReferrerPolicy": false, "hasPermissionsPolicy": false, "exposesServerFingerprint": true, "externalScriptCount": 7, "externalScriptsWithoutIntegrity": 7, "vulnerableLibraryCount": 0 }, "observed": { "headers": { "cache-control": "max-age=300, public", "content-encoding": "gzip", "content-language": "es", "content-length": "16036", "content-type": "text/html; charset=UTF-8", "date": "Mon, 13 Apr 2026 22:45:18 GMT", "etag": "\"1776120318-gzip\"", "expires": "Sun, 19 Nov 1978 05:00:00 GMT", "last-modified": "Mon, 13 Apr 2026 22:45:18 GMT", "server": "nginx", "vary": "Cookie,Accept-Encoding", "via": "1.1 ca2190123e61f1744d1210c24c87c840.cloudfront.net (CloudFront)", "x-amz-cf-id": "YY2njMnLHyb16STRfBtBZFgl3vCmYaSFqGgXRrUVs8qCjrb5EpGV_w==", "x-amz-cf-pop": "IAD12-P5", "x-cache": "Miss from cloudfront", "x-content-type-options": "nosniff", "x-frame-options": "SAMEORIGIN", "x-generator": "Drupal 10 (https://www.drupal.org)" }, "vulnerableLibrariesAuditScore": null, "vulnerableLibraries": [] }, "recommendations": [ { "title": "Add a Content-Security-Policy header", "urgency": "high", "detail": "Add an appropriate CSP to reduce script injection and resource loading risk." }, { "title": "Enable Strict-Transport-Security", "urgency": "medium", "detail": "Set a Strict-Transport-Security header to enforce HTTPS on repeat visits." }, { "title": "Define a Referrer-Policy", "urgency": "low", "detail": "Set a referrer policy to reduce unnecessary URL data leakage." }, { "title": "Define a Permissions-Policy", "urgency": "low", "detail": "Restrict browser capabilities to only what the application needs." }, { "title": "Add SRI to external scripts", "urgency": "medium", "detail": "7 external script tag(s) are missing integrity attributes." } ] }, "expectedFiles": { "score": 25, "urgency": "low", "origin": "https://www.barcelona.cat", "checks": [ { "path": "/robots.txt", "kind": "expected", "url": "https://www.barcelona.cat/robots.txt", "found": true, "status": 200, "contentType": "text/plain" }, { "path": "/sitemap.xml", "kind": "beneficial", "url": "https://www.barcelona.cat/sitemap.xml", "found": true, "status": 200, "contentType": "application/xml; charset=utf-8" }, { "path": "/.well-known/security.txt", "kind": "beneficial", "url": "https://www.barcelona.cat/.well-known/security.txt", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/manifest.webmanifest", "kind": "beneficial", "url": "https://www.barcelona.cat/manifest.webmanifest", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/favicon.ico", "kind": "beneficial", "url": "https://www.barcelona.cat/favicon.ico", "found": true, "status": 200, "contentType": "image/x-icon" } ], "recommendations": [ { "title": "Add beneficial discoverability and maintenance files", "urgency": "low", "detail": "Missing beneficial file(s): /.well-known/security.txt, /manifest.webmanifest." } ] }, "mediaHints": { "score": 20, "urgency": "low", "checks": { "hasDarkMode": false, "hasMetaColorScheme": false, "hasDarkModeQuery": false, "autoplayingMedia": [], "autoplayCount": 0, "unmutedAutoplayCount": 0, "totalImages": 80, "imagesWithLazy": 42, "imagesWithoutLazy": 38 }, "recommendations": [ { "title": "Add dark mode support", "urgency": "medium", "detail": "No prefers-color-scheme: dark media query or color-scheme meta tag was found. Dark mode reduces energy use on OLED screens and improves user choice." } ] }, "wsgCustom": { "score": 85, "urgency": "medium", "data": { "hasPrintStyles": true, "hasReducedMotion": true, "media": { "totalImages": 85, "lazyImages": 43, "totalIframes": 1, "lazyIframes": 0 }, "typography": { "primaryFont": "\"Source Sans Pro\", \"Helvetica Neue\", Helvetica, Arial, sans-serif", "usesSystemFont": true }, "tracking": { "count": 0, "scripts": [] }, "semantics": { "hasNavigation": true, "hasMainContent": true } }, "recommendations": [ { "guideline": "11.3", "title": "Incomplete media lazy loading", "urgency": "medium", "detail": "Only 43/85 images use loading=\"lazy\". Global lazy loading reduces initial data transfer and energy consumption.", "wsid": "11.lazy loading", "assessor": "script", "example": "\"Description\"\n\n" }, { "guideline": "2.4", "title": "Review User Journey Efficiency", "urgency": "investigate", "detail": "Have a human walk through the main user journeys and verify they require the fewest steps possible. Unnecessary steps waste user time and device energy. Look for redundant confirmations, forced account creation, and non-essential interstitials.", "wsid": "2.minimize non-essential content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#minimize-non-essential-content-interactivity-or-journeys", "assessor": "human" }, { "guideline": "2.6", "title": "Check for Engagement Traps", "urgency": "investigate", "detail": "Manually review the page for patterns that artificially prolong engagement: infinite scroll, autoplay carousels, sticky overlays, and notification permission prompts. These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human" }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human" }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 2401358.55, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 1348968.5499999998, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "estimatedSavingsBytes": 1052390, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 1.29 MB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 1.00 MB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 2549898.55, "totalEstimatedBlockingMs": 1500, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 1348968.5499999998, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,317 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 1052390, "estimatedBlockingMs": 0, "displayValue": "Est savings of 1,028 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1500, "displayValue": "Est savings of 1,500 ms", "urgency": "high", "sourceAuditId": "render-blocking-resources" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 83415, "estimatedBlockingMs": 0, "displayValue": "Est savings of 81 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 54011, "estimatedBlockingMs": 0, "displayValue": "Est savings of 53 KiB", "urgency": "medium", "sourceAuditId": "unused-javascript" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 11114, "estimatedBlockingMs": 0, "displayValue": "Est savings of 11 KiB", "urgency": "low", "sourceAuditId": "offscreen-images" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 1.29 MB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 1.00 MB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1500 ms." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 81.46 KB." }, { "title": "Remove unused JavaScript", "urgency": "medium", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 52.75 KB." }, { "title": "Lazy-load offscreen images", "urgency": "low", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 10.85 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 168010.8397346369 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.07 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.07 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 5, "urgency": "medium", "transferBytes": 2326594, "css": { "unusedBytes": 83415, "ratio": 0.0358528389568614, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 54011, "duplicatedBytes": 0, "ratio": 0.023214621889336946, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 83415, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 54011, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 17, "urgency": "high", "transferBytes": 2326594, "estimatedDeferrableBytes": 148540, "renderBlockingMs": 1500, "breakdown": { "offscreenImageSavings": 11114, "unusedJavascriptSavings": 54011, "unusedCssSavings": 83415 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 11114, "strategy": 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"https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": 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"https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=ejwLke&url=https%3A%2F%2Fwww.barcelona.cat%2Fes%2Fvivir-en-bcn", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 13, "urgency": "medium", "transferBytes": 2326594, "estimatedRedundantBytes": 137426, "redundancyRatio": 0.05906746084619835, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 83415, "displayValue": "Est savings of 81 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 54011, "displayValue": "Est savings of 53 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 83415, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 54011, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 12, "urgency": "medium", "totalTransferBytes": 2326594, "heavyRequestCount": 5, "heavyBytes": 377652, "heavyRatio": 0.16231968276373102, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_menu/public/nens_nenes_paola_2.jpg?itok=uRF8gAbD", "transferSize": 103804, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90561, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76425, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54920, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_qDD4BCxE8K-iT7MRORwp32v03DlJblP9-xrYwOBWlQo.css?delta=5&language=es&theme=barcelonacat_theme&include=eJyFz0FqxTAMBNALxd-LHsiMHTVxcSQjyenP7Wso_FJI6Upi5m0GH4MdB7EnnNXE4vcJ6HXJ0EJNGAWe5CTVupLFqUdwkTb7v0zHRuGs9Pkb-E4HxSzi5oqeysp34B1crizPu25rktGC-dUqb3eiFgl47boTJmNmycCW3v4DXWXJhdNkivj6Ej2dlNGWDsU21-wWVx0d7fGTPAb3kVu1ndbFLnM6YobRF2idlFA&tcut5n", "transferSize": 51942, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "font", "count": 2, "transferBytes": 145481 }, { "resourceType": "image", "count": 1, "transferBytes": 103804 }, { "resourceType": "script", "count": 1, "transferBytes": 76425 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 51942 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 4, "transferBytes": 301227 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Split JavaScript by route or interaction", "urgency": "medium", "estimatedSavingsBytes": 54011, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 103804, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/distribuidora_banner_menu/public/nens_nenes_paola_2.jpg?itok=uRF8gAbD", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90561, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76425, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.05, "displayValue": "7.2 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 7.2 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 53 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 53 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 81 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 81 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 1,317 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 1,317 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 1,028 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 1,028 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,500 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,500 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "server-response-time", "title": "Reduce initial server response time", "description": "Keep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).", "score": 0, "displayValue": "Root document took 620 ms", "impact": "high", "wsg": { "categoryId": "4", "categoryName": "Hosting, Infrastructure, and Systems", "id": "11", "title": "Ensure infrastructure fits project requirements", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements", "subheading": "Maintain the infrastructure you require rather than over-provisioning. Autoscale to meet demand and preserve hardware resources." }, "assessor": "script", "issueTemplate": "## Improve Reduce initial server response time\n\n- Lighthouse audit: server-response-time\n- Current value: Root document took 620 ms\n- WSG guideline: 11 Ensure infrastructure fits project requirements\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements\n\n### Why this matters\nKeep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.85, "displayValue": "3.7 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.7 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. 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These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human" }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human" }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 17, "urgency": "low", "totalEstimatedSavingsBytes": 130442.55, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "medium", "estimatedSavingsBytes": 72410.55, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "medium", "estimatedSavingsBytes": 58032, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "medium", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 70.71 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 56.67 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 331716.55, "totalEstimatedBlockingMs": 1483, "opportunities": [ { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1483, "displayValue": "Est savings of 1,480 ms", "urgency": "high", "sourceAuditId": "render-blocking-resources" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 87109, "estimatedBlockingMs": 0, "displayValue": "Est savings of 85 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 81684, "estimatedBlockingMs": 0, "displayValue": "Est savings of 80 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 72410.55, "estimatedBlockingMs": 0, "displayValue": "Est savings of 71 KiB", "urgency": "medium", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 58032, "estimatedBlockingMs": 0, "displayValue": "Est savings of 57 KiB", "urgency": "medium", "sourceAuditId": "uses-optimized-images" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 32481, "estimatedBlockingMs": 0, "displayValue": "Est savings of 32 KiB", "urgency": "low", "sourceAuditId": "unused-javascript" } ], "recommendations": [ { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1483 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 79.77 KB." }, { "title": "Serve images in next-gen formats", "urgency": "medium", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 70.71 KB." }, { "title": "Compress oversized image assets", "urgency": "medium", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 56.67 KB." }, { "title": "Remove unused JavaScript", "urgency": "low", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 31.72 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 167991.86445530725 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.05 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.05 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 8, "urgency": "medium", "transferBytes": 775358, "css": { "unusedBytes": 81684, "ratio": 0.1053500447535203, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 32481, "duplicatedBytes": 0, "ratio": 0.0418916165177892, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 81684, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 22, "urgency": "high", "transferBytes": 775358, "estimatedDeferrableBytes": 201274, "renderBlockingMs": 1483, "breakdown": { "offscreenImageSavings": 87109, "unusedJavascriptSavings": 32481, "unusedCssSavings": 81684 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 87109, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "medium", "estimatedSavingsBytes": 81684, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1483, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90559, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 84136, "url": "https://www.barcelona.cat/themes/barcelonacat_theme/images/menu/viula.jpg", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy script from cdn.matomo.cloud", "area": "script", "urgency": "medium", "estimatedSavingsBytes": 76426, "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139668, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76426, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31746, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15565, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7145, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5656, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=tpmBgX&url=https%3A%2F%2Fwww.barcelona.cat%2Fes%2Faviso-legal%2Fbanoasistido", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 18, "urgency": "low", "transferBytes": 775358, "estimatedRedundantBytes": 114165, "redundancyRatio": 0.1472416612713095, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 81684, "displayValue": "Est savings of 80 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 32481, "displayValue": "Est savings of 32 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 81684, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 21, "urgency": "medium", "totalTransferBytes": 775358, "heavyRequestCount": 4, "heavyBytes": 271007, "heavyRatio": 0.34952499361585226, "heavyRequests": [ { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90559, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76426, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54919, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_evpTRQTawGYS1Ro7RbXq3hBxwat7AU-RJm1V8ZgzeaE.css?delta=5&language=es&theme=barcelonacat_theme&include=eJyFzkEKwzAMBMAPxfjQB5m1I1IXRzKSkja_r6EQKKT0pGV3DsJjY8dK7Al7NbH4OQG9ThlaqAmjwJPspFpnsjj0Flykjf2X6Vgo7JWe38DvtFLMIm6u6KnMfAWWJhktmB-t8nIlapGA8_crYbKNLhnY0u0f6CpTLpwGU8QzJXo5KaNNdpjTGjOM3gg5eRY&tcut5n", "transferSize": 49103, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "font", "count": 2, "transferBytes": 145478 }, { "resourceType": "script", "count": 1, "transferBytes": 76426 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 49103 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 3, "transferBytes": 194581 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76426 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 87109, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90559, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76426, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.13, "displayValue": "6.0 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 6.0 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 80 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 80 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 71 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 71 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 57 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 57 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 85 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 85 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,480 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,480 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "server-response-time", "title": "Reduce initial server response time", "description": "Keep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).", "score": 0, "displayValue": "Root document took 610 ms", "impact": "high", "wsg": { "categoryId": "4", "categoryName": "Hosting, Infrastructure, and Systems", "id": "11", "title": "Ensure infrastructure fits project requirements", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements", "subheading": "Maintain the infrastructure you require rather than over-provisioning. Autoscale to meet demand and preserve hardware resources." }, "assessor": "script", "issueTemplate": "## Improve Reduce initial server response time\n\n- Lighthouse audit: server-response-time\n- Current value: Root document took 610 ms\n- WSG guideline: 11 Ensure infrastructure fits project requirements\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements\n\n### Why this matters\nKeep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.86, "displayValue": "3.7 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.7 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0.5, "displayValue": "Est savings of 32 KiB", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 32 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "926 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 926 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" } ] }, { "url": "https://barcelona.cat/es/blogoteca/condiciones-uso", "status": "ok", "finalUrl": "https://www.barcelona.cat/es/blogoteca/condiciones-uso", "performanceScore": 0.71, "bestPracticesScore": 1, "transferBytes": 810438, "co2Grams": 0.3104637236532, "greenWeb": { "page": { "hostname": "www.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:38:00.231825", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.barcelona.cat", "error": null }, "externalAssets": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 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Estimated render unblocking: 1487 ms." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 79.70 KB." }, { "title": "Serve images in next-gen formats", "urgency": "medium", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 70.71 KB." }, { "title": "Compress oversized image assets", "urgency": "medium", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 68.86 KB." }, { "title": "Remove unused JavaScript", "urgency": "low", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 31.72 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 167993.8709846369 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 8, "urgency": "medium", "transferBytes": 810438, "css": { "unusedBytes": 81613, "ratio": 0.10070233626754915, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 32481, "duplicatedBytes": 0, "ratio": 0.0400783280152214, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 81613, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 22, "urgency": "high", "transferBytes": 810438, "estimatedDeferrableBytes": 201202, "renderBlockingMs": 1487, "breakdown": { "offscreenImageSavings": 87108, "unusedJavascriptSavings": 32481, "unusedCssSavings": 81613 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 87108, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "medium", "estimatedSavingsBytes": 81613, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1487, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90562, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 84136, "url": "https://www.barcelona.cat/themes/barcelonacat_theme/images/menu/viula.jpg", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy script from cdn.matomo.cloud", "area": "script", "urgency": "medium", "estimatedSavingsBytes": 76425, "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139456, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76425, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31745, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15565, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7145, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=E91nF7&url=https%3A%2F%2Fwww.barcelona.cat%2Fes%2Fblogoteca%2Fcondiciones-uso", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 18, "urgency": "low", "transferBytes": 810438, "estimatedRedundantBytes": 114094, "redundancyRatio": 0.14078066428277056, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 81613, "displayValue": "Est savings of 80 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 32481, "displayValue": "Est savings of 32 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 81613, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 32481, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 20, "urgency": "medium", "totalTransferBytes": 810438, "heavyRequestCount": 4, "heavyBytes": 271000, "heavyRatio": 0.3343870845147932, "heavyRequests": [ { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90562, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76425, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54919, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_evpTRQTawGYS1Ro7RbXq3hBxwat7AU-RJm1V8ZgzeaE.css?delta=5&language=es&theme=barcelonacat_theme&include=eJyFzkEKwzAMBMAPxfjQB5m1I1IXRzKSkja_r6EQKKT0pGV3DsJjY8dK7Al7NbH4OQG9ThlaqAmjwJPspFpnsjj0Flykjf2X6Vgo7JWe38DvtFLMIm6u6KnMfAWWJhktmB-t8nIlapGA8_crYbKNLhnY0u0f6CpTLpwGU8QzJXo5KaNNdpjTGjOM3gg5eRY&tcut5n", "transferSize": 49094, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "font", "count": 2, "transferBytes": 145481 }, { "resourceType": "script", "count": 1, "transferBytes": 76425 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 49094 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 3, "transferBytes": 194575 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 87108, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90562, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76425, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.13, "displayValue": "6.0 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 6.0 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 80 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 80 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 71 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 71 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 69 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 69 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 85 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 85 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,490 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,490 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0.5, "displayValue": "Est savings of 32 KiB", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 32 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "945 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 945 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). 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This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 82738, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 58024, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", 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"transferBytes": 642529 }, { "resourceType": "font", "count": 2, "transferBytes": 145481 }, { "resourceType": "script", "count": 1, "transferBytes": 76425 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 51937 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 7, "transferBytes": 839947 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "high", "estimatedSavingsBytes": 313499, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Split JavaScript by route or interaction", "urgency": "medium", "estimatedSavingsBytes": 58024, "strategy": "Move non-critical bundles behind route-level or event-driven imports so they are only fetched on demand.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 213834, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/destacat_gran/public/ciutatvella_529x361-1001_2.jpg?itok=UZqpQj0K", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.05, "displayValue": "7.2 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 7.2 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0, "displayValue": "Est savings of 57 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 57 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 81 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 81 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 879 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 879 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 632 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 632 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 306 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 306 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,490 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,490 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "server-response-time", "title": "Reduce initial server response time", "description": "Keep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).", "score": 0, "displayValue": "Root document took 800 ms", "impact": "high", "wsg": { "categoryId": "4", "categoryName": "Hosting, Infrastructure, and Systems", "id": "11", "title": "Ensure infrastructure fits project requirements", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements", "subheading": "Maintain the infrastructure you require rather than over-provisioning. Autoscale to meet demand and preserve hardware resources." }, "assessor": "script", "issueTemplate": "## Improve Reduce initial server response time\n\n- Lighthouse audit: server-response-time\n- Current value: Root document took 800 ms\n- WSG guideline: 11 Ensure infrastructure fits project requirements\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements\n\n### Why this matters\nKeep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0, "displayValue": "1,155 elements", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,155 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.7, "displayValue": "4.6 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 4.6 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. 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en el censo de organizadores.", "ogType": "Web", "ogUrl": "https://www.barcelona.cat/es/que-hacer-en-bcn/banos-y-playas/actividades-deportivas-organizadas-por-deportistas-federados", "twitterCard": "summary_large_image", "ldJsonCount": 0, "validLdJsonCount": 0, "invalidLdJsonCount": 0 }, "recommendations": [ { "title": "Metadata structure looks healthy", "urgency": "low", "detail": "Core machine-readable metadata is present and no structural issues were detected." } ] }, "layoutAdaptation": { "score": 30, "urgency": "medium", "checks": { "testedMobile": true, "testedTablet": true, "horizontalOverflowOnMobile": false, "horizontalOverflowOnTablet": false, "mobileSmallTapTargets": 36, "tabletSmallTapTargets": 34, "fixedWidthOffenders": 0, "oversizedMedia": 0, "scanErrors": 0 }, "perDevice": [ { "device": "mobile", "viewportWidth": 390, "viewportHeight": 844, "contentWidth": 390, "horizontalOverflowPx": 0, "hasHorizontalOverflow": false, "fixedWidthOffenders": 0, "smallTapTargets": 36, "oversizedMedia": 0 }, { "device": "tablet", "viewportWidth": 820, "viewportHeight": 1180, "contentWidth": 820, "horizontalOverflowPx": 0, "hasHorizontalOverflow": false, "fixedWidthOffenders": 0, "smallTapTargets": 34, "oversizedMedia": 0 } ], "recommendations": [ { "title": "Increase touch target sizes", "urgency": "high", "detail": "Ensure interactive controls are at least 44x44 CSS px. Detected 36 small targets on mobile and 34 on tablet." } ] }, "securityLight": { "score": 59, "urgency": "medium", "checks": { "isHttps": true, "hasHsts": false, "hasCsp": false, "hasXContentTypeOptions": true, "hasReferrerPolicy": false, "hasPermissionsPolicy": false, "exposesServerFingerprint": true, "externalScriptCount": 7, "externalScriptsWithoutIntegrity": 7, "vulnerableLibraryCount": 0 }, "observed": { "headers": { "cache-control": "max-age=300, public", "content-encoding": "gzip", "content-language": "es", "content-length": "10494", "content-type": "text/html; charset=UTF-8", "date": "Mon, 13 Apr 2026 22:46:14 GMT", "etag": "\"1776120374-gzip\"", "expires": "Sun, 19 Nov 1978 05:00:00 GMT", "last-modified": "Mon, 13 Apr 2026 22:46:14 GMT", "server": "nginx", "vary": "Cookie,Accept-Encoding", "via": "1.1 ca2190123e61f1744d1210c24c87c840.cloudfront.net (CloudFront)", "x-amz-cf-id": "N_ErBC38ZJ89JsR5HGDmD_HmBz7XRwKCd2_mZEQFdQ1vCFnZmHWbjQ==", "x-amz-cf-pop": "IAD12-P5", "x-cache": "Miss from cloudfront", "x-content-type-options": "nosniff", "x-frame-options": "SAMEORIGIN", "x-generator": "Drupal 10 (https://www.drupal.org)" }, "vulnerableLibrariesAuditScore": null, "vulnerableLibraries": [] }, "recommendations": [ { "title": "Add a Content-Security-Policy header", "urgency": "high", "detail": "Add an appropriate CSP to reduce script injection and resource loading risk." }, { "title": "Enable Strict-Transport-Security", "urgency": "medium", "detail": "Set a Strict-Transport-Security header to enforce HTTPS on repeat visits." }, { "title": "Define a Referrer-Policy", "urgency": "low", "detail": "Set a referrer policy to reduce unnecessary URL data leakage." }, { "title": "Define a Permissions-Policy", "urgency": "low", "detail": "Restrict browser capabilities to only what the application needs." }, { "title": "Add SRI to external scripts", "urgency": "medium", "detail": "7 external script tag(s) are missing integrity attributes." } ] }, "expectedFiles": { "score": 25, "urgency": "low", "origin": "https://www.barcelona.cat", "checks": [ { "path": "/robots.txt", "kind": "expected", "url": "https://www.barcelona.cat/robots.txt", "found": true, "status": 200, "contentType": "text/plain" }, { "path": "/sitemap.xml", "kind": "beneficial", "url": "https://www.barcelona.cat/sitemap.xml", "found": true, "status": 200, "contentType": "application/xml; charset=utf-8" }, { "path": "/.well-known/security.txt", "kind": "beneficial", "url": "https://www.barcelona.cat/.well-known/security.txt", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/manifest.webmanifest", "kind": "beneficial", "url": "https://www.barcelona.cat/manifest.webmanifest", "found": false, "status": 404, "contentType": "text/html" }, { "path": "/favicon.ico", "kind": "beneficial", "url": "https://www.barcelona.cat/favicon.ico", "found": true, "status": 200, "contentType": "image/x-icon" } ], "recommendations": [ { "title": "Add beneficial discoverability and maintenance files", "urgency": "low", "detail": "Missing beneficial file(s): /.well-known/security.txt, /manifest.webmanifest." } ] }, "mediaHints": { "score": 45, "urgency": "medium", "checks": { "hasDarkMode": false, "hasMetaColorScheme": false, "hasDarkModeQuery": false, "autoplayingMedia": [], "autoplayCount": 0, "unmutedAutoplayCount": 0, "totalImages": 12, "imagesWithLazy": 1, "imagesWithoutLazy": 11 }, "recommendations": [ { "title": "Add dark mode support", "urgency": "medium", "detail": "No prefers-color-scheme: dark media query or color-scheme meta tag was found. Dark mode reduces energy use on OLED screens and improves user choice." }, { "title": "Add loading=\"lazy\" to images", "urgency": "high", "detail": "11 of 12 image(s) lack an explicit loading=\"lazy\" attribute. Lazy loading defers below-fold images and reduces initial page weight." } ] }, "wsgCustom": { "score": 85, "urgency": "medium", "data": { "hasPrintStyles": true, "hasReducedMotion": true, "media": { "totalImages": 17, "lazyImages": 2, "totalIframes": 1, "lazyIframes": 0 }, "typography": { "primaryFont": "\"Source Sans Pro\", \"Helvetica Neue\", Helvetica, Arial, sans-serif", "usesSystemFont": true }, "tracking": { "count": 0, "scripts": [] }, "semantics": { "hasNavigation": true, "hasMainContent": true } }, "recommendations": [ { "guideline": "11.3", "title": "Incomplete media lazy loading", "urgency": "medium", "detail": "Only 2/17 images use loading=\"lazy\". Global lazy loading reduces initial data transfer and energy consumption.", "wsid": "11.lazy loading", "assessor": "script", "example": "\"Description\"\n\n" }, { "guideline": "2.4", "title": "Review User Journey Efficiency", "urgency": "investigate", "detail": "Have a human walk through the main user journeys and verify they require the fewest steps possible. Unnecessary steps waste user time and device energy. Look for redundant confirmations, forced account creation, and non-essential interstitials.", "wsid": "2.minimize non-essential content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#minimize-non-essential-content-interactivity-or-journeys", "assessor": "human" }, { "guideline": "2.6", "title": "Check for Engagement Traps", "urgency": "investigate", "detail": "Manually review the page for patterns that artificially prolong engagement: infinite scroll, autoplay carousels, sticky overlays, and notification permission prompts. These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human" }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human" }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 51, "urgency": "medium", "totalEstimatedSavingsBytes": 531361.75, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 296882.75, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "high", "estimatedSavingsBytes": 234479, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 289.92 KB." }, { "title": "Improve image encoding quality/size", "urgency": "high", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 228.98 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 762390.75, "totalEstimatedBlockingMs": 878, "opportunities": [ { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 296882.75, "estimatedBlockingMs": 0, "displayValue": "Est savings of 290 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 234479, "estimatedBlockingMs": 0, "displayValue": "Est savings of 229 KiB", "urgency": "high", "sourceAuditId": "uses-optimized-images" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 87110, "estimatedBlockingMs": 0, "displayValue": "Est savings of 85 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 81415, "estimatedBlockingMs": 0, "displayValue": "Est savings of 80 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 878, "displayValue": "Est savings of 880 ms", "urgency": "medium", "sourceAuditId": "render-blocking-resources" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 31867, "estimatedBlockingMs": 0, "displayValue": "Est savings of 31 KiB", "urgency": "low", "sourceAuditId": "unused-javascript" }, { "id": "uses-responsive-images", "title": "Right-size images for viewport", "detail": "Avoid sending larger images than the rendered size needs.", "estimatedSavingsBytes": 30637, "estimatedBlockingMs": 0, "displayValue": "Est savings of 30 KiB", "urgency": "low", "sourceAuditId": "uses-responsive-images" } ], "recommendations": [ { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 289.92 KB." }, { "title": "Compress oversized image assets", "urgency": "high", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 228.98 KB." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 79.51 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "medium", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 878 ms." }, { "title": "Remove unused JavaScript", "urgency": "low", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code. Estimated byte savings: 31.12 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 7, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "7 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 167994.70195530725 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 164.06 KB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 7, "urgency": "medium", "transferBytes": 1047238, "css": { "unusedBytes": 81415, "ratio": 0.07774259528397556, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 31867, "duplicatedBytes": 0, "ratio": 0.030429568063802117, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 81415, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 31867, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 14, "urgency": "medium", "transferBytes": 1047238, "estimatedDeferrableBytes": 200392, "renderBlockingMs": 878, "breakdown": { "offscreenImageSavings": 87110, "unusedJavascriptSavings": 31867, "unusedCssSavings": 81415 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 87110, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 31867, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "medium", "estimatedSavingsBytes": 81415, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "medium", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 878, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "high", "estimatedSavingsBytes": 271637, "url": "https://www.barcelona.cat/sites/default/files/styles/galeria_medium/public/Activitats%20Esportives%20organitzades_0.jpg?itok=jUBp2eIx", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90560, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy script from cdn.matomo.cloud", "area": "script", "urgency": "medium", "estimatedSavingsBytes": 76426, "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#give-third-parties-the-same-priority-as-first-parties-during-assessment" }, "score": 64, "urgency": "high", "providerCount": 7, "requestCount": 8, "transferBytes": 139455, "notGreenCount": 5, "unknownCount": 0, "scripts": [ { "hostname": "cdn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 76426, "sampleUrl": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "greenCheck": { "hostname": "cdn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T08:54:12.814577", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.matomo.cloud", "error": null } }, { "hostname": "cdn.lawwwing.com", "resourceType": "script", "requestCount": 1, "transferBytes": 31745, "sampleUrl": "https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": 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"ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7143, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=LoTxuw&url=https%3A%2F%2Fwww.barcelona.cat%2Fes%2Fque-hacer-en-bcn%2Fbanos-y-playas%2Factividades-deportivas-organizadas-por-deportistas-federados", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 7 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 16, "urgency": "low", "transferBytes": 1047238, "estimatedRedundantBytes": 113282, "redundancyRatio": 0.10817216334777768, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 81415, "displayValue": "Est savings of 80 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 31867, "displayValue": "Est savings of 31 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 81415, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 31867, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 28, "urgency": "medium", "totalTransferBytes": 1047238, "heavyRequestCount": 5, "heavyBytes": 542658, "heavyRatio": 0.518180203544944, "heavyRequests": [ { "url": "https://www.barcelona.cat/sites/default/files/styles/galeria_medium/public/Activitats%20Esportives%20organitzades_0.jpg?itok=jUBp2eIx", "transferSize": 271637, "resourceType": "image", "mimeType": "image/jpeg", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90560, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76426, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54921, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_evpTRQTawGYS1Ro7RbXq3hBxwat7AU-RJm1V8ZgzeaE.css?delta=5&language=es&theme=barcelonacat_theme&include=eJyFzsGKwzAMBNAfiuvDfpAZOyJxcSQjydn272sodFnIsieJmXcY3Ac7DmJPOKuJxfcJ6HXJ0EJNGAWe5CTVupLFqUdwkTb7v0zHRuGs9P0b-E4HxSzi5oqeyspXYGuS0YL5s1XerkQtEvDZfiVMxsySgS19_Qe6ypILp8kU8fMlejgpoy0dim0u3i2uOjra7Se5De4jt2o7rYs9zemIGUYvwgyJSg&tcut5n", "transferSize": 49114, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "image", "count": 1, "transferBytes": 271637 }, { "resourceType": "font", "count": 2, "transferBytes": 145481 }, { "resourceType": "script", "count": 1, "transferBytes": 76426 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 49114 } ], "groupedByOrigin": [ { "domain": "www.barcelona.cat", "count": 4, "transferBytes": 466232 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76426 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 87110, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "medium", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from www.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 271637, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://www.barcelona.cat/sites/default/files/styles/galeria_medium/public/Activitats%20Esportives%20organitzades_0.jpg?itok=jUBp2eIx", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90560, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy script asset from cdn.matomo.cloud", "urgency": "medium", "estimatedSavingsBytes": 76426, "strategy": "Load this script only on pages or interactions that require it; prefer dynamic import and feature-level bundles.", "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0, "displayValue": "9.7 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 9.7 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 80 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 80 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 290 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 290 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 229 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 229 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 85 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 85 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 880 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 880 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.85, "displayValue": "3.7 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 3.7 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0.5, "displayValue": "Est savings of 31 KiB", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 31 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. 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These waste user attention and device energy.", "wsid": "2.design to assist not distract", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#design-to-assist-and-not-to-distract", "assessor": "human" }, { "guideline": "2.7", "title": "Audit for Deceptive Design Patterns", "urgency": "investigate", "detail": "Have a human identify dark patterns: misleading consent dialogs, hidden unsubscribe links, forced continuity, and bait-and-switch flows. Deceptive patterns waste user time and undermine trust.", "wsid": "2.avoid manipulative deceptive", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#avoid-being-manipulative-or-deceptive", "assessor": "human" }, { "guideline": "2.14", "title": "Verify Accessible Alternatives for All Media", "urgency": "investigate", "detail": "Manually check that every video has captions, every audio file has a transcript, every image has meaningful alt text, and every PDF has an accessible HTML alternative. Alternatives let assistive technology users avoid re-downloading heavy formats.", "wsid": "2.offer suitable alternatives", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#offer-suitable-alternatives-for-every-format-used", "assessor": "human" }, { "guideline": "2.18", "title": "Confirm User Research Was Conducted", "urgency": "investigate", "detail": "Verify that genuine user research or usability testing has informed the design. Research-driven design reduces wasted iterations, removes unnecessary features, and ensures the product meets real needs efficiently.", "wsid": "2.involve users early", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#involve-users-early-in-the-project", "assessor": "human" }, { "guideline": "2.10", "title": "Review Content Conciseness", "urgency": "investigate", "detail": "Use a Large Language Model (e.g. locally or via API) to evaluate page text for conciseness and clarity. Removing superfluous text reduces payload, reading time, and inference energy for search engines indexing this content.", "wsid": "2.provide clear inclusive content", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#provide-clear-inclusive-content-with-purpose", "assessor": "ai" }, { "guideline": "4.4", "title": "Verify Error Pages and Redirects Are Configured", "urgency": "investigate", "detail": "Have a human check that custom 404 and 500 error pages exist and that there are no redirect chains longer than one hop. Broken links force wasted round-trips. Redirect chains multiply transfer costs.", "wsid": "4.error pages redirection", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#setup-necessary-error-pages-and-redirection-links", "assessor": "human" }, { "guideline": "4.10", "title": "Review CDN Usage and Geographic Distribution", "urgency": "investigate", "detail": "Confirm that static assets are served from a CDN and that the CDN edge nodes are geographically close to the primary audience. CDN misuse—or absence—increases last-mile transfer distance and the associated energy cost of data delivery.", "wsid": "4.content delivery networks", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#use-content-delivery-networks-cdns-appropriately", "assessor": "human" }, { "guideline": "5.2", "title": "Confirm a Sustainability Advocate Is Assigned", "urgency": "investigate", "detail": "Verify that someone on the team has explicit responsibility for web sustainability. Without a designated advocate, sustainability improvements tend to be deprioritized and never reach the backlog.", "wsid": "5.assign sustainability advocate", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#assign-a-sustainability-advocate", "assessor": "human" }, { "guideline": "5.8", "title": "Check for a Public Sustainability Statement", "urgency": "investigate", "detail": "Look for a publicly accessible sustainability statement, disclosure page, or environmental policy. Mandatory disclosure requirements are growing globally and transparency builds user trust. The statement should include measurable targets and dates.", "wsid": "5.support mandatory disclosures", "wsgUrl": "https://www.w3.org/TR/web-sustainability-guidelines/#support-mandatory-disclosures-and-reporting", "assessor": "human" } ] }, "compressionOpportunities": { "wsgReference": { "title": "Reduce data transfer with compression", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#reduce-data-transfer-with-compression" }, "score": 50, "urgency": "medium", "totalEstimatedSavingsBytes": 980128.75, "checks": { "hasEffectiveTextCompression": true }, "opportunities": [ { "id": "modern-image-formats", "title": "Use modern image compression formats", "urgency": "high", "estimatedSavingsBytes": 888512.75, "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size." }, { "id": "uses-optimized-images", "title": "Improve image encoding quality/size", "urgency": "medium", "estimatedSavingsBytes": 91616, "detail": "Re-encode oversized images and tune compression quality for significant byte savings." } ], "recommendations": [ { "title": "Use modern image compression formats", "urgency": "high", "detail": "Prefer AVIF/WebP over legacy formats where possible to reduce transfer size. Estimated savings: 867.69 KB." }, { "title": "Improve image encoding quality/size", "urgency": "medium", "detail": "Re-encode oversized images and tune compression quality for significant byte savings. Estimated savings: 89.47 KB." } ] }, "optimizationOpportunities": { "wsgReference": { "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service" }, "score": 100, "urgency": "high", "totalEstimatedSavingsBytes": 2114187.75, "totalEstimatedBlockingMs": 1631, "opportunities": [ { "id": "uses-responsive-images", "title": "Right-size images for viewport", "detail": "Avoid sending larger images than the rendered size needs.", "estimatedSavingsBytes": 933711, "estimatedBlockingMs": 0, "displayValue": "Est savings of 912 KiB", "urgency": "high", "sourceAuditId": "uses-responsive-images" }, { "id": "modern-image-formats", "title": "Serve images in next-gen formats", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP.", "estimatedSavingsBytes": 888512.75, "estimatedBlockingMs": 0, "displayValue": "Est savings of 868 KiB", "urgency": "high", "sourceAuditId": "modern-image-formats" }, { "id": "render-blocking-resources", "title": "Eliminate render-blocking resources", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering.", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1631, "displayValue": "Est savings of 1,630 ms", "urgency": "high", "sourceAuditId": "render-blocking-resources" }, { "id": "uses-optimized-images", "title": "Compress oversized image assets", "detail": "Re-encode large images to reduce transfer weight without visible quality loss.", "estimatedSavingsBytes": 91616, "estimatedBlockingMs": 0, "displayValue": "Est savings of 89 KiB", "urgency": "medium", "sourceAuditId": "uses-optimized-images" }, { "id": "offscreen-images", "title": "Lazy-load offscreen images", "detail": "Defer below-the-fold imagery until it is likely to be viewed.", "estimatedSavingsBytes": 87109, "estimatedBlockingMs": 0, "displayValue": "Est savings of 85 KiB", "urgency": "medium", "sourceAuditId": "offscreen-images" }, { "id": "unused-css-rules", "title": "Remove unused CSS", "detail": "Trim unused selectors and split CSS so only needed styles are shipped.", "estimatedSavingsBytes": 81391, "estimatedBlockingMs": 0, "displayValue": "Est savings of 79 KiB", "urgency": "medium", "sourceAuditId": "unused-css-rules" }, { "id": "unused-javascript", "title": "Remove unused JavaScript", "detail": "Reduce dead JS and split bundles to avoid shipping non-critical code.", "estimatedSavingsBytes": 31848, "estimatedBlockingMs": 0, "displayValue": "Est savings of 31 KiB", "urgency": "low", "sourceAuditId": "unused-javascript" } ], "recommendations": [ { "title": "Right-size images for viewport", "urgency": "high", "detail": "Avoid sending larger images than the rendered size needs. Estimated byte savings: 911.83 KB." }, { "title": "Serve images in next-gen formats", "urgency": "high", "detail": "Convert high-byte images to more efficient formats such as AVIF or WebP. Estimated byte savings: 867.69 KB." }, { "title": "Eliminate render-blocking resources", "urgency": "high", "detail": "Inline critical assets and defer non-critical scripts/styles for faster rendering. Estimated render unblocking: 1631 ms." }, { "title": "Compress oversized image assets", "urgency": "medium", "detail": "Re-encode large images to reduce transfer weight without visible quality loss. Estimated byte savings: 89.47 KB." }, { "title": "Lazy-load offscreen images", "urgency": "medium", "detail": "Defer below-the-fold imagery until it is likely to be viewed. Estimated byte savings: 85.07 KB." }, { "title": "Remove unused CSS", "urgency": "medium", "detail": "Trim unused selectors and split CSS so only needed styles are shipped. Estimated byte savings: 79.48 KB." } ] }, "dependencyMaintenance": { "wsgReference": { "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance" }, "score": 10, "urgency": "medium", "vulnerableLibraryCount": 0, "vulnerableLibraries": [], "externalScriptsWithoutIntegrity": 8, "recommendations": [ { "title": "Add integrity attributes for external dependencies", "urgency": "medium", "detail": "8 external script dependency URL(s) are missing SRI integrity attributes." } ] }, "offlineSupport": { "wsgReference": { "title": "Optimize caching and support offline access", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-caching-and-support-offline-access" }, "score": 100, "urgency": "high", "checks": { "hasServiceWorker": false, "worksOffline": false, "hasInstallableManifest": false, "hasOfflineStartUrl": false, "longCacheTtlScore": 0.5, "cacheSavingsBytes": 1266537.839734637 }, "opportunities": [ { "id": "service-worker", "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "id": "works-offline", "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "id": "installable-manifest", "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "id": "offline-start-url", "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "id": "uses-long-cache-ttl", "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 1.21 MB)." } ], "recommendations": [ { "title": "Add service worker support", "urgency": "high", "detail": "Register a service worker to support resilient caching and offline behavior for key routes." }, { "title": "Ensure critical routes work offline", "urgency": "high", "detail": "Provide an offline fallback strategy for key pages and shell assets." }, { "title": "Improve web app manifest support", "urgency": "medium", "detail": "Complete manifest fields so clients can install and run an app-like experience." }, { "title": "Support offline start URL behavior", "urgency": "medium", "detail": "Ensure start URL and shell routing can load in disconnected conditions." }, { "title": "Strengthen static asset cache TTL", "urgency": "medium", "detail": "Improve long-lived cache headers for immutable static assets (estimated savings opportunity: 1.21 MB)." } ] }, "languageVersionGuidance": { "wsgReference": { "title": "Use the latest stable language version", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-latest-stable-language-version" }, "score": 0, "urgency": "low", "observedTechnologies": [], "outdatedTechnologies": [], "vulnerableLibraryCount": 0, "recommendations": [ { "title": "No obvious outdated runtime version disclosed", "urgency": "low", "detail": "No clearly outdated runtime version signals were exposed in sampled HTTP headers. Verify language/runtime versions in source and CI since backend versions are not always externally visible." } ] }, "deadCode": { "score": 5, "urgency": "medium", "transferBytes": 1943859, "css": { "unusedBytes": 81391, "ratio": 0.041870835281777125, "auditId": "unused-css-rules" }, "javascript": { "unusedBytes": 31848, "duplicatedBytes": 0, "ratio": 0.016383904388126917, "auditIds": [ "unused-javascript", "duplicated-javascript" ] }, "html": { "estimatedPenalty": 0.125, "totalBodyElements": 0, "maxDepth": 0, "maxChildElements": 0, "note": "HTML dead code cannot be measured directly from Lighthouse. This score estimates unnecessary markup from DOM size and complexity signals." }, "recommendations": [ { "area": "css", "title": "Remove unused CSS selectors and component styles", "urgency": "high", "estimatedSavingsBytes": 81391, "strategy": "Trim styles that never match rendered markup and split component CSS so only used styles are shipped.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, { "area": "javascript", "title": "Remove unused JavaScript and feature bundles", "urgency": "medium", "estimatedSavingsBytes": 31848, "strategy": "Drop unused packages and feature code, or move them behind route-level or interaction-triggered imports.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "4", "title": "Remove unnecessary code", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-code", "subheading": "Clear out dead or unused code as it builds up in a project to reduce the amount of wasted data being transferred." } }, "nonCriticalResources": { "score": 18, "urgency": "high", "transferBytes": 1943859, "estimatedDeferrableBytes": 200348, "renderBlockingMs": 1631, "breakdown": { "offscreenImageSavings": 87109, "unusedJavascriptSavings": 31848, "unusedCssSavings": 81391 }, "candidates": [ { "title": "Lazy-load offscreen images", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 87109, "strategy": "Load below-the-fold images only when they approach the viewport.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Defer non-critical JavaScript", "area": "javascript", "urgency": "medium", "estimatedSavingsBytes": 31848, "strategy": "Split bundles and load feature code on interaction or route transition.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Inline critical CSS and defer remainder", "area": "stylesheet", "urgency": "medium", "estimatedSavingsBytes": 81391, "strategy": "Ship only above-the-fold CSS in initial render path and defer non-critical styles.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Eliminate render-blocking resources", "area": "render-path", "urgency": "high", "estimatedSavingsBytes": 0, "estimatedBlockingMs": 1631, "strategy": "Defer scripts/styles not required for first paint and preload only truly critical assets.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from media-edg.barcelona.cat", "area": "image", "urgency": "high", "estimatedSavingsBytes": 440153, "url": "https://media-edg.barcelona.cat/wp-content/uploads/2026/03/26182455/Obres-Endesa-Miramar-Tarongers-570x321.png", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy font from www.barcelona.cat", "area": "font", "urgency": "medium", "estimatedSavingsBytes": 90560, "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, { "title": "Evaluate deferred loading for heavy image from www.barcelona.cat", "area": "image", "urgency": "medium", "estimatedSavingsBytes": 84136, "url": "https://www.barcelona.cat/themes/barcelonacat_theme/images/menu/viula.jpg", "strategy": "Confirm this asset is required for first paint; defer or lazy-load if not critical.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "8", "title": "Defer the loading of non-critical resources", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#defer-the-loading-of-non-critical-resources", "subheading": "Avoid render-blocking slowdowns by asynchronously loading, deferring, or prioritizing external resources as appropriate." } }, "thirdPartyJs": { "wsgReference": { "title": "Give third parties the same priority as first parties during assessment", "url": 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"https://cdn.lawwwing.com/widgets/current/19e3126d-e1c9-4f40-9e90-8d7c407ac1cb/cookie-widget.min.js", "greenCheck": { "hostname": "cdn.lawwwing.com", "checked": true, "status": "green", "green": true, "hostedBy": "Hetzner Online GmbH", "hostedByWebsite": "https://www.hetzner.com", "listedProvider": true, "partner": null, "modified": "2025-11-06T10:31:21", "supportingDocuments": [ { "id": 1094, "title": "Sustainability page", "link": "https://www.hetzner.com/unternehmen/nachhaltigkeit/" }, { "id": 1469, "title": "Renewable Energy Certificates - Finland", "link": "https://media.greenweb.org/uploads/Hetzner-Finland-Oy-HydroGoO-Diploma-25-26_FfGBnqO.pdf" }, { "id": 2070, "title": "EMAS Certfificate - Germany", "link": "https://cdn.hetzner.com/assets/downloads/Certificate_EMAS_EN_Hetzner.jpg" }, { "id": 2071, "title": "ISO14001:2015", "link": "https://media.greenweb.org/uploads/Zertifikat_ISO14001_Hetzner_20250729_EN_eK.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/cdn.lawwwing.com", "error": null } }, { "hostname": "stackpath.bootstrapcdn.com", "resourceType": "script", "requestCount": 1, "transferBytes": 15566, "sampleUrl": "https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js", "greenCheck": { "hostname": "stackpath.bootstrapcdn.com", "checked": true, "status": "green", "green": true, "hostedBy": "Cloudflare", "hostedByWebsite": "https://www.cloudflare.com", "listedProvider": true, "partner": null, "modified": "2025-11-25T09:50:38", "supportingDocuments": [ { "id": 18, "title": "Blog post - The Climate and Cloudflare", "link": "https://blog.cloudflare.com/the-climate-and-cloudflare/" }, { "id": 1264, "title": "Cloudflare 2023 Emissions Inventory", "link": "https://media.greenweb.org/uploads/Cloudflare_2023_Emissions_Inventory.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/stackpath.bootstrapcdn.com", "error": null } }, { "hostname": "www.youtube.com", "resourceType": "script", "requestCount": 2, "transferBytes": 11061, "sampleUrl": "https://www.youtube.com/iframe_api", "greenCheck": { "hostname": "www.youtube.com", "checked": true, "status": "green", "green": true, "hostedBy": "Google Cloud", "hostedByWebsite": "https://cloud.google.com", "listedProvider": true, "partner": null, "modified": "2026-01-10T15:09:17", "supportingDocuments": [ { "id": 108, "title": "Sustainability at Google", "link": "https://sustainability.google" }, { "id": 1364, "title": "Google 2024 Environmental Report", "link": "https://www.gstatic.com/gumdrop/sustainability/google-2024-environmental-report.pdf" }, { "id": 1365, "title": "Alphabet 2024 CDP Climate Change Response", "link": "https://www.gstatic.com/gumdrop/sustainability/alphabet-2024-cdp-climate-change-response.pdf" }, { "id": 1366, "title": "Google 2024 Supplier Responsibility Report.", "link": "https://www.gstatic.com/gumdrop/sustainability/google-2024-supplier-responsibility-report.pdf" }, { "id": 1367, "title": "Alphabet FY2023 Environmental Indicators Assurance Letter", "link": "https://www.gstatic.com/gumdrop/sustainability/alphabet-fy2023-environmental-indicators-assurance-letter.pdf" }, { "id": 1368, "title": "3Degrees Cloud Services Review Statement", "link": "https://services.google.com/fh/files/misc/3degrees_cloud_services_review_statement_final.pdf" } ], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/www.youtube.com", "error": null } }, { "hostname": "ajuntament.barcelona.cat", "resourceType": "script", "requestCount": 2, "transferBytes": 7145, "sampleUrl": "https://ajuntament.barcelona.cat/widgets/bcn-avisos/js/bcn-avisos.js", "greenCheck": { "hostname": "ajuntament.barcelona.cat", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.422404", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/ajuntament.barcelona.cat", "error": null } }, { "hostname": "code.jquery.com", "resourceType": "script", "requestCount": 1, "transferBytes": 5446, "sampleUrl": "https://code.jquery.com/jquery-migrate-1.0.0.js", "greenCheck": { "hostname": "code.jquery.com", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T16:13:08.750558", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/code.jquery.com", "error": null } }, { "hostname": "plausible.io", "resourceType": "script", "requestCount": 1, "transferBytes": 2861, "sampleUrl": "https://plausible.io/js/script.file-downloads.hash.outbound-links.pageview-props.tagged-events.js", "greenCheck": { "hostname": "plausible.io", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T02:27:14.095680", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/plausible.io", "error": null } }, { "hostname": "dadesbcn.matomo.cloud", "resourceType": "script", "requestCount": 1, "transferBytes": 269, "sampleUrl": "https://dadesbcn.matomo.cloud/plugins/HeatmapSessionRecording/configs.php?idsite=19&trackerid=NpBbac&url=https%3A%2F%2Fwww.barcelona.cat%2Fen%2Fwhat-to-do-in-bcn%2Fmontjuic-park%2Fnews", "greenCheck": { "hostname": "dadesbcn.matomo.cloud", "checked": true, "status": "not-green", "green": false, "hostedBy": null, "hostedByWebsite": null, "listedProvider": null, "partner": null, "modified": "2026-04-13T22:37:59.905790", "supportingDocuments": [], "source": "https://api.thegreenwebfoundation.org/api/v3/greencheck/dadesbcn.matomo.cloud", "error": null } } ], "recommendations": [ { "title": "Maintain a third-party JavaScript inventory", "urgency": "high", "detail": "Track 8 third-party script origin(s) and assign an owner plus business justification for each." }, { "title": "Reduce third-party script payload and requests", "urgency": "high", "detail": "Defer non-critical tags, remove unused vendors, and gate scripts behind consent or user interaction." }, { "title": "Prioritize greener alternatives for third-party providers", "urgency": "high", "detail": "5 third-party script origin(s) are not confirmed green in the Green Web Foundation dataset." } ] }, "redundancy": { "score": 13, "urgency": "low", "transferBytes": 1943859, "estimatedRedundantBytes": 113239, "redundancyRatio": 0.05825473966990404, "relatedAuditIds": [ "unused-css-rules", "unused-javascript", "duplicated-javascript", "dom-size", "uses-text-compression", "unminified-css", "unminified-javascript" ], "wasteByAudit": [ { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "savingsBytes": 81391, "displayValue": "Est savings of 79 KiB" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "savingsBytes": 31848, "displayValue": "Est savings of 31 KiB" } ], "recommendations": [ { "title": "Reduce unused css", "urgency": "medium", "estimatedSavingsBytes": 81391, "auditId": "unused-css-rules", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce unused javascript", "urgency": "medium", "estimatedSavingsBytes": 31848, "auditId": "unused-javascript", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, { "title": "Reduce DOM complexity and redundant markup", "urgency": "medium", "estimatedSavingsBytes": 0, "auditId": "dom-size", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." } }, "modularization": { "score": 28, "urgency": "medium", "totalTransferBytes": 1943859, "heavyRequestCount": 6, "heavyBytes": 988944, "heavyRatio": 0.5087529496738189, "heavyRequests": [ { "url": "https://media-edg.barcelona.cat/wp-content/uploads/2026/03/26182455/Obres-Endesa-Miramar-Tarongers-570x321.png", "transferSize": 440153, "resourceType": "image", "mimeType": "image/png", "domain": "media-edg.barcelona.cat" }, { "url": "https://media-edg.barcelona.cat/wp-content/uploads/2026/03/09145120/MNAC-570x321.png", "transferSize": 277780, "resourceType": "image", "mimeType": "image/png", "domain": "media-edg.barcelona.cat" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "transferSize": 90560, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://cdn.matomo.cloud/dadesbcn.matomo.cloud/container_beOBY9ep.js", "transferSize": 76425, "resourceType": "script", "mimeType": "application/javascript", "domain": "cdn.matomo.cloud" }, { "url": "https://www.barcelona.cat/assetsdi/icoajuntament/fonts/icoajuntament.ttf?8aaig7", "transferSize": 54920, "resourceType": "font", "mimeType": "font/ttf", "domain": "www.barcelona.cat" }, { "url": "https://www.barcelona.cat/sites/default/files/css/css_evpTRQTawGYS1Ro7RbXq3hBxwat7AU-RJm1V8ZgzeaE.css?delta=5&language=en&theme=barcelonacat_theme&include=eJyFzksKwzAMBNAL2XjRA5mxo6YuimUsOW1u30ChH0jpSsPMWwjXUQ0LVYvINsDFYGGiMwabOnzMa1HR8DwerbiEnomlIsOirNR7mUjDroc3Ed73X6ZhJr8Wun0Du9BCIYmYWkeLeapHYGZJYK-2canzkShZ_Pv3I6Ey9i4qqsbTP9C6uJRr3FlHeKVId6NewU43NVpCgtIDxTWFiw&tcut5n", "transferSize": 49106, "resourceType": "stylesheet", "mimeType": "text/css", "domain": "www.barcelona.cat" } ], "groupedByType": [ { "resourceType": "image", "count": 2, "transferBytes": 717933 }, { "resourceType": "font", "count": 2, "transferBytes": 145480 }, { "resourceType": "script", "count": 1, "transferBytes": 76425 }, { "resourceType": "stylesheet", "count": 1, "transferBytes": 49106 } ], "groupedByOrigin": [ { "domain": "media-edg.barcelona.cat", "count": 2, "transferBytes": 717933 }, { "domain": "www.barcelona.cat", "count": 3, "transferBytes": 194586 }, { "domain": "cdn.matomo.cloud", "count": 1, "transferBytes": 76425 } ], "onDemandCandidates": [ { "title": "Lazy-load offscreen images and media galleries", "urgency": "medium", "estimatedSavingsBytes": 87109, "strategy": "Load imagery only when it enters the viewport or when a user opens the relevant section.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Defer non-critical UI modules until after first render", "urgency": "high", "estimatedSavingsBytes": 0, "strategy": "Keep only above-the-fold resources in the initial path; hydrate or import secondary modules later.", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy image asset from media-edg.barcelona.cat", "urgency": "high", "estimatedSavingsBytes": 440153, "strategy": "Serve a smaller placeholder first and load this asset only when the user scrolls to or requests the component.", "url": "https://media-edg.barcelona.cat/wp-content/uploads/2026/03/26182455/Obres-Endesa-Miramar-Tarongers-570x321.png", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, { "title": "Modularize heavy font asset from www.barcelona.cat", "urgency": "medium", "estimatedSavingsBytes": 90560, "strategy": "Subset or defer this font so full font payloads are only fetched when needed.", "url": "https://www.barcelona.cat/assetsdi/icoajuntament-v2/fonts/icoajuntament-v2.ttf?4n8bjk", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } } ], "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." } }, "findings": [ { "auditId": "largest-contentful-paint", "title": "Largest Contentful Paint", "description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)", "score": 0.1, "displayValue": "6.3 s", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Largest Contentful Paint\n\n- Lighthouse audit: largest-contentful-paint\n- Current value: 6.3 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nLargest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-css-rules", "title": "Reduce unused CSS", "description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).", "score": 0, "displayValue": "Est savings of 79 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused CSS\n\n- Lighthouse audit: unused-css-rules\n- Current value: Est savings of 79 KiB\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nReduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "modern-image-formats", "title": "Serve images in next-gen formats", "description": "Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).", "score": 0, "displayValue": "Est savings of 868 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Serve images in next-gen formats\n\n- Lighthouse audit: modern-image-formats\n- Current value: Est savings of 868 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nImage formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. [Learn more about modern image formats](https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "uses-optimized-images", "title": "Efficiently encode images", "description": "Optimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).", "score": 0, "displayValue": "Est savings of 89 KiB", "impact": "high", "wsg": { "categoryId": "2", "categoryName": "User Experience Design", "id": "11", "title": "Optimize media to reduce resource use", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use", "subheading": "Ensure all media - including audio, video, animation, images, and other novel formats, when deemed necessary in the design, are optimized, correctly sized and formatted, use lazy loading where appropriate, with a usage policy in place." }, "assessor": "script", "issueTemplate": "## Improve Efficiently encode images\n\n- Lighthouse audit: uses-optimized-images\n- Current value: Est savings of 89 KiB\n- WSG guideline: 11 Optimize media to reduce resource use\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#optimize-media-to-reduce-resource-use\n\n### Why this matters\nOptimized images load faster and consume less cellular data. [Learn how to efficiently encode images](https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "offscreen-images", "title": "Defer offscreen images", "description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).", "score": 0, "displayValue": "Est savings of 85 KiB", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "3", "title": "Modularize bandwidth-heavy components", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components", "subheading": "Break down large components into smaller, self-contained pieces that can be requested only when required to save bandwidth." }, "assessor": "script", "issueTemplate": "## Improve Defer offscreen images\n\n- Lighthouse audit: offscreen-images\n- Current value: Est savings of 85 KiB\n- WSG guideline: 3 Modularize bandwidth-heavy components\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#modularize-bandwidth-heavy-components\n\n### Why this matters\nConsider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn how to defer offscreen images](https://developer.chrome.com/docs/lighthouse/performance/offscreen-images/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "render-blocking-resources", "title": "Eliminate render-blocking resources", "description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).", "score": 0, "displayValue": "Est savings of 1,630 ms", "impact": "high", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "18", "title": "Use the most efficient solution for your service", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service", "subheading": "Identify the project requirements, use the most efficient approach, aim for static over dynamic where possible, and consider the impact of extensions and components." }, "assessor": "script", "issueTemplate": "## Improve Eliminate render-blocking resources\n\n- Lighthouse audit: render-blocking-resources\n- Current value: Est savings of 1,630 ms\n- WSG guideline: 18 Use the most efficient solution for your service\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-the-most-efficient-solution-for-your-service\n\n### Why this matters\nResources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn how to eliminate render-blocking resources](https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "server-response-time", "title": "Reduce initial server response time", "description": "Keep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).", "score": 0, "displayValue": "Root document took 1,150 ms", "impact": "high", "wsg": { "categoryId": "4", "categoryName": "Hosting, Infrastructure, and Systems", "id": "11", "title": "Ensure infrastructure fits project requirements", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements", "subheading": "Maintain the infrastructure you require rather than over-provisioning. Autoscale to meet demand and preserve hardware resources." }, "assessor": "script", "issueTemplate": "## Improve Reduce initial server response time\n\n- Lighthouse audit: server-response-time\n- Current value: Root document took 1,150 ms\n- WSG guideline: 11 Ensure infrastructure fits project requirements\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#ensure-infrastructure-fits-project-requirements\n\n### Why this matters\nKeep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "speed-index", "title": "Speed Index", "description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).", "score": 0.66, "displayValue": "4.8 s", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "1", "title": "Set goals based on performance and energy impact", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact", "subheading": "Account for the difference in energy intensity that different types of content may have on a project and set goals based on what you would like to achieve." }, "assessor": "script", "issueTemplate": "## Improve Speed Index\n\n- Lighthouse audit: speed-index\n- Current value: 4.8 s\n- WSG guideline: 1 Set goals based on performance and energy impact\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#set-goals-based-on-performance-and-energy-impact\n\n### Why this matters\nSpeed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "unused-javascript", "title": "Reduce unused JavaScript", "description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).", "score": 0.5, "displayValue": "Est savings of 31 KiB", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "16", "title": "Use dependencies appropriately and ensure maintenance", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance", "subheading": "Use libraries and frameworks only where necessary, when plain code or smaller packages are inappropriate for the use case, and they are kept up to date." }, "assessor": "script", "issueTemplate": "## Improve Reduce unused JavaScript\n\n- Lighthouse audit: unused-javascript\n- Current value: Est savings of 31 KiB\n- WSG guideline: 16 Use dependencies appropriately and ensure maintenance\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#use-dependencies-appropriately-and-ensure-maintenance\n\n### Why this matters\nReduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).\n\n### Definition of done\n- [ ] Metric improves in Lighthouse on key templates\n- [ ] Changes documented in release notes\n- [ ] Re-scan confirms improvement" }, { "auditId": "dom-size", "title": "Avoid an excessive DOM size", "description": "A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/lighthouse/performance/dom-size/).", "score": 0.5, "displayValue": "1,031 elements", "impact": "medium", "wsg": { "categoryId": "3", "categoryName": "Web Development", "id": "2", "title": "Remove unnecessary or redundant information", "url": "https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information", "subheading": "Remove redundant characters from code to reduce the amount of data being stored and transferred to devices." }, "assessor": "script", "issueTemplate": "## Improve Avoid an excessive DOM size\n\n- Lighthouse audit: dom-size\n- Current value: 1,031 elements\n- WSG guideline: 2 Remove unnecessary or redundant information\n- WSG link: https://www.w3.org/TR/web-sustainability-guidelines/#remove-unnecessary-or-redundant-information\n\n### Why this matters\nA large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow). 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