vital-scans open quality ledger

www.cdc.gov: Lighthouse — week 2026-W38

174 pages sampled by Google Lighthouse (its own headless Chrome). Scores are 0–100 (higher is better); metrics are Core Web Vitals. Download: CSV (per-page scores) · JSON (AI-ready, includes recommendations) · Priority pages CSV · Priority pages JSON.

Trend

Lighthouse category scores over 17 weeks
Performance Accessibility Best practices SEO W24W32W401000
Lighthouse category scores by week
WeekPerformanceAccessibilityBest practicesSEO
2026-W2482100100100
2026-W257710096100
2026-W267810096100
2026-W2780100100100
2026-W288210096100
2026-W298210096100
2026-W308410096100
2026-W318210096100
2026-W328210096100
2026-W337710096100
2026-W347910096100
2026-W358310096100
2026-W368610096100
2026-W378010096100
2026-W388310096100
2026-W398099100100
2026-W4082100100100

History & Trends → Severity, Lighthouse and other measures across 17 weeks.

Performance impact

How far pages fall short of Google's "good" benchmarks: Largest Contentful Paint ≤ 2.5s and page weight ≤ 1.6 MB. Lower is better.

Avg extra LCP over 2.5s
1.8s 97/174 pages over
Avg extra weight over 1.6 MB
4.22 MB 122/177 pages over

Set page_loads_per_week for this target to also estimate total wasted time and data (the way daily-dap uses traffic counts).

Medians across sampled pages

Performance
83/100
Accessibility
100/100
Best practices
96/100
SEO
100/100
Agentic browsing
94/100
Largest Contentful Paint
2.8s
First Contentful Paint
1.5s
Speed Index
4.0s
Total Blocking Time
0.1s
Cumulative Layout Shift
0

Recommendations

Issues Lighthouse flagged across the 174 sampled page(s), beyond the headline scores — grouped by category and ranked by how many pages they affect. Estimated savings (transfer bytes or load time) are Lighthouse's own estimates where available. Accessibility audits are intentionally omitted; they overlap with the axe-core findings on the Accessibility page.

Performance

Performance recommendations from Lighthouse, by sampled pages affected.
RecommendationPagesEst. saving
JavaScript execution time 172/174 49.5s
Reduce unused JavaScript 172/174 26.4 MB · 19.9s
Minimizes main-thread work 168/174 43.8s
Network dependency tree 162/174 —
Use efficient cache lifetimes 140/174 297.4s
Time to Interactive 128/174 —
Reduce unused CSS 119/174 9.9 MB · 49.6s
Render-blocking requests 114/174 67.5s
Avoid multiple page redirects 99/174 69.7s
Largest Contentful Paint 97/174 —
Minify JavaScript 96/174 4.4 MB · 10.4s
Speed Index 91/174 —
Font display 70/174 4.0s
Improve image delivery 62/174 84.8s
Total Blocking Time 58/174 —
Max Potential First Input Delay 54/174 —
Layout shift culprits 51/174 —
LCP request discovery 45/174 —
First Contentful Paint 43/174 —
Document request latency 19/174 6.1s
Reduce initial server response time 16/174 8.2s
Forced reflow 16/174 —
Legacy JavaScript 9/174 0.7s
Minify CSS 6/174 106 KB · 0.3s
Page prevented back/forward cache restoration 6/174 —

Best Practices

Best Practices recommendations from Lighthouse, by sampled pages affected.
RecommendationPagesEst. saving
Serves images with low resolution 62/174 —
Browser errors were logged to the console 61/174 —
Page lacks the HTML doctype, thus triggering quirks-mode 55/174 —
Issues were logged in the `Issues` panel in Chrome Devtools 55/174 —
Does not use HTTPS 49/174 —
Displays images with incorrect aspect ratio 28/174 —
Charset declaration is missing or occurs too late in the HTML 14/174 —
Missing source maps for large first-party JavaScript 6/174 —
Uses third-party cookies 1/174 —

SEO

SEO recommendations from Lighthouse, by sampled pages affected.
RecommendationPagesEst. saving
Document does not have a meta description 58/174 —
Image elements do not have `[alt]` attributes 49/174 —
Links do not have descriptive text 12/174 —
Links are not crawlable 1/174 —

Agentic (AI-readiness)

Agentic (AI-readiness) recommendations from Lighthouse, by sampled pages affected.
RecommendationPagesEst. saving
WebMCP tools registered 174/174 —
WebMCP form coverage 174/174 —
WebMCP schemas are valid 174/174 —
llms.txt follows recommendations 174/174 —
Cumulative Layout Shift 55/174 —
Accessibility tree is not well-formed 44/174 —

What the Agentic score means

The Agentic (AI-readiness) score is new in Google Lighthouse (13.4+). It measures how well a page works for AI agents and assistants — the tools that increasingly mediate how people find and use government services. It checks for things like an llms.txt file (a machine-readable guide for language models), valid structured data, a well-formed accessibility tree that agents can parse, and WebMCP tool/form descriptions. A higher score means an AI assistant is more likely to understand the page and complete tasks on a citizen's behalf correctly.

It is experimental and evolving; treat it as a forward-looking signal, not a compliance requirement. Median across sampled pages: 94/100.

Gaps found on the sampled pages: WebMCP tools registered (174), WebMCP form coverage (174), WebMCP schemas are valid (174), llms.txt follows recommendations (174), Cumulative Layout Shift (55), Accessibility tree is not well-formed (44).

Per-page results

Lighthouse scores and Core Web Vitals per sampled page (2026-W38). Agentic = experimental agentic-browsing score. PWA / offline readiness is tracked in the Standards tab (Lighthouse 12+ removed the PWA category). — click a column heading to sort
/global-hiv-tb/php/globalhiv/index.html9110096921001.6s2.8s5.0s0.1s0.002
/infection-control/hcp/disinfection-and-sterilization/flash-steam-sterilization-parameters.html8896100100991.6s2.9s5.7s0.1s0.058
/mmwr/preview/mmwrhtml/mm5033a4.htm1006265831000.8s0.8s0.8s0.0s0
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/nchs/linked-data/medicare/index.html8510096100961.2s3.6s4.5s0.1s0.091
/ncbddd/about/protecting-people.html81100100100951.2s3.9s5.1s0.1s0.098
/niosh/bulletin/2024/sept-11.html78100961001001.6s2.6s6.9s0.4s0.007
/zika/php/transmission/index.html6810096100951.7s6.1s5.8s0.2s0.098
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/global-health/impact/another-battle-won-against-ebola.html56100100100931.6s10.5s7.0s0.4s0.112
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/vaccines/hcp/storage-handling/providers-role.html94100100921001.2s2.4s4.2s0.1s0.002
/tobacco/basic_information/menthol/state-menthol-fact-sheets.html4810010092582.0s2.4s6.3s1.0s0.501
/niosh/npg/npgd0489.html57100100100712.2s6.2s5.1s0.1s0.291
/diabetes/es/healthy-eating/contar-carbohidratos.html60100100100931.5s3.6s5.7s0.9s0.116
/mmwr/preview/mmwrhtml/mm5343a5.htm1006265831000.8s1.2s0.8s0.1s0
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/global-health/countries/drc.html77961001001001.8s2.7s7.0s0.4s0.037
/national-program-cancer-registries/index.html75100100921001.6s5.3s5.7s0.1s0.001
/yersinia/about68100100100732.0s3.1s6.4s0.2s0.27
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/sti/php/ept-legal-status/hawaii.html931001001001001.2s2.6s4.0s0.2s0.014
/prams/php/methodology961001001001001.2s2.0s4.3s0.1s0.022
/asthma/NHIS/default.htm71100100100672.3s3.0s2.3s0.2s0.337
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/sepsis/communication-resources/gaos-school-checklist.html77100100921001.2s4.6s6.1s0.1s0.025
/mmwr/preview/mmwrhtml/00015016.htm906263831001.4s1.5s1.4s0.4s0
/nchs/pressroom/releases/20221103.html90100961001001.2s3.2s4.5s0.1s0.005
/listeria/php/surveillance/listeria-initiative.html8110096100981.7s4.6s1.9s0.1s0.073
/asthma/nhis/05/table4-2.htm5496100100592.0s5.5s2.0s0.2s0.494
/overdose-prevention/reversing-overdose/about-naloxone.html82100100100901.5s3.5s4.7s0.1s0.136
/mmwr/volumes/66/wr/mm6640a4.htm629896100761.8s2.9s3.0s0.8s0.239
/niosh/docs/2017-20277100100100171.2s2.2s4.4s0.2s0.332
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/wtc/administrator.html909896100502.3s2.7s2.3s0.2s0
/valley-fever/hcp/clinical-overview/index.html72100100100851.4s4.3s5.2s0.2s0.169
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/chickenpox/es/site.html80100961001001.6s2.3s4.5s0.6s0.002
/nchs/fastats/hispanic-health.htm511009692632.3s6.6s2.3s0.3s0.39
/mmwr/volumes/70/wr/mm7044e2.htm639896100712.3s3.5s2.3s0.4s0.287
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/mmwr/volumes/71/wr/mm7135a4.htm639896100712.3s3.5s3.1s0.4s0.288
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/hemophilia-community-counts/php/data-reports/index.html791001001001001.2s3.8s6.1s0.2s0.002
/niosh-rtecs/BD124F80.html7896100100362.1s2.9s2.1s0.4s0.164
/niosh/docs/2011-174/default.html83100100100331.2s2.7s4.1s0.2s0.188
/mmwr/volumes/71/wr/mm7102a4.htm609896100712.3s4.1s2.3s0.4s0.287
/niosh/mining/partnerships/index.html621001001001002.6s27.7s7.8s0.1s0.016
/mmwr/volumes/65/wr/mm6525a4.htm759896100762.0s3.1s3.0s0.3s0.244
/mmwr/preview/mmwrhtml/mm6305a4.htm97848592501.8s2.1s1.8s0.1s0
/pcd/issues/2007/apr/06_0073_fr.htm100666583500.8s1.1s0.8s0.1s0
/niosh/publications/numbered/2002-142.html74100100100181.5s2.9s4.8s0.1s0.329
/tobacco/campaign/tips311009692541.7s4.6s7.4s0.9s0.669
/condom-use/es/site.html941001001001001.2s1.6s5.1s0.2s0.015
/asthma/healthcare-use/2010/data.htm5510096100672.3s5.7s2.7s0.2s0.336
/nchs/pressroom/upcoming.htm96100961001001.8s2.4s1.9s0.1s0.001
/niosh/bulletin/2022/holiday-3.html62100100100831.5s6.6s5.7s0.1s0.185
/mmwr/preview/mmwrhtml/00015058.htm1006263831001.3s1.3s1.3s0.0s0
/mmwr/preview/mmwrhtml/00000992.htm1006263831001.3s1.3s1.3s0.1s0
/lupus/about/index.html771001001001001.6s4.3s5.1s0.2s0.001
/niosh/docs/2012-14982100100100461.2s3.6s5.8s0.1s0.093
/pcd/issues/2008/apr/06_0145.htm97706583501.0s1.2s1.0s0.2s0
/sepsis/communication-resources/gaos-letters.html82100100100941.2s3.6s4.8s0.1s0.109
/comprehensive-cancer-control/success-stories/texas-voucher-program.html821001001001001.5s4.0s5.7s0.1s0.009
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/nhsn/about-nhsn/dua-faq.html5910096100562.3s3.1s2.3s0.4s0.548
/asthma/brfss/08/brfsstechinfo.htm5695100100612.3s5.7s2.3s0.1s0.439
/healthy-swimming/es/toolkit/operating-public-pools-hot-tubs-and-splash-pads.html39100100100842.5s35.5s10.2s0.6s0.176
/niosh/docs/2023-11871100100100431.2s6.0s4.5s0.1s0.117
/mmwr/volumes/72/wr/mm7242a2.htm659596100762.1s4.0s2.1s0.3s0.239
/mmwr/preview/mmwrhtml/mm5646a1.htm1006265831000.8s1.2s0.8s0.1s0
/hepatitis/statistics/SurveillanceGuidance/References.htm9293100100471.4s2.2s4.4s0.2s0.084
/pcd/issues/2008/oct/07_0194_es.htm100666783501.1s1.3s1.1s0.1s0
/PCD/issues/2006/apr/05_0171_es.htm100666783501.2s1.4s1.2s0.1s0
/ems-community-paramedicine/php/us/disparities.html6897100100501.4s2.1s9.0s1.1s0.034
/nchs/nhanes/participant.htm9210096921001.2s2.0s5.8s0.1s0.004
/hearing-loss-children-guide/about/index.html65100100921001.8s37.4s8.3s0.1s0.013
/bird-flu/php/avian-flu-summary/reported-human-infections.html931001001001001.2s2.0s5.0s0.2s0.012
/mmwr/preview/mmwrhtml/00001643.htm1006262831000.8s0.9s0.8s0.1s0
/mmwr/preview/mmwrhtml/mm6417a6.htm99798583501.4s2.0s1.4s0.1s0
/pcd/issues/2008/jan/07_0150.htm74706583501.1s1.5s2.0s1.5s0
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/pcd/issues/2007/jan/06_0029.htm99706783501.3s1.7s1.3s0.1s0
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/ecr/php/stories/index.html80100100100941.6s2.6s5.1s0.4s0.105
/stophivtogether/hiv-prevention/pep.html49979692572.1s8.3s2.3s0.2s0.54
/hepatitis/statistics/2021surveillance/hepatitis-c.htm681001001001001.7s6.1s6.7s0.2s0
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/vaginal-vulvar-cancers/es/resources/index.html861001001001001.6s2.3s4.6s0.4s0.034
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