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www.cdc.gov: Lighthouse — semaine 2026-W40

166 pages échantillonnées par Google Lighthouse (son propre Chrome sans interface). Les scores vont de 0 à 100 (plus c'est haut, mieux c'est) ; les métriques sont les Core Web Vitals. Télécharger : CSV (scores par page) · JSON (prêt pour l'IA, inclut des recommandations) · CSV des pages prioritaires · JSON des pages prioritaires.

Tendance

Scores par catégorie Lighthouse sur 17 semaines
Performance Accessibilité Bonnes pratiques SEO W24W32W401000
Scores par catégorie Lighthouse par semaine
SemainePerformanceAccessibilitéBonnes pratiquesSEO
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.

Impact sur la performance

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
3.5s 105/165 pages over
Avg extra weight over 1.6 MB
3.94 MB 142/193 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).

Médianes sur les pages échantillonnées

Performance
82/100
Accessibilité
100/100
Bonnes pratiques
100/100
SEO
100/100
Navigation agentique
94/100
Plus grand affichage de contenu (LCP)
3.0s
Premier affichage de contenu (FCP)
1.6s
Indice de vitesse
4.3s
Temps de blocage total
0.2s
Décalage cumulatif de la mise en page
0.018

Recommandations

Problèmes signalés par Lighthouse sur les 166 page(s) échantillonnée(s), au-delà des scores principaux — regroupés par catégorie et classés selon le nombre de pages concernées. Les économies estimées (octets transférés ou temps de chargement) sont les propres estimations de Lighthouse lorsqu'elles sont disponibles. Les audits d'accessibilité sont volontairement omis ; ils recoupent les constats d'axe-core sur la page Accessibilité.

Performance

Performance recommandations de Lighthouse, par pages échantillonnées concernées.
RecommandationPagesÉconomie est.
Reduce unused JavaScript 164/166 24.9 MB · 28.9s
JavaScript execution time 163/166 42.8s
Minimize main-thread work 159/166 37.1s
Network dependency tree 158/166 —
Use efficient cache lifetimes 148/166 418.6s
Time to Interactive 140/166 —
Render-blocking requests 126/166 77.8s
Reduce unused CSS 125/166 9.8 MB · 54.5s
Minify JavaScript 107/166 4.4 MB · 10.9s
Largest Contentful Paint 105/166 —
Font display 99/166 5.5s
Speed Index 99/166 —
Avoid multiple page redirects 90/166 70.8s
Improve image delivery 61/166 120.7s
Total Blocking Time 56/166 —
LCP request discovery 52/166 —
Max Potential First Input Delay 51/166 —
Layout shift culprits 50/166 —
First Contentful Paint 49/166 —
Forced reflow 26/166 —
Document request latency 16/166 1.4s
Legacy JavaScript 13/166 1.9s
Page prevented back/forward cache restoration 8/166 —
Initial server response time was short 4/166 0.3s
Minify CSS 2/166 30 KB

Bonnes pratiques

Bonnes pratiques recommandations de Lighthouse, par pages échantillonnées concernées.
RecommandationPagesÉconomie est.
Browser errors were logged to the console 50/166 —
Serves images with low resolution 44/166 —
Page lacks the HTML doctype, thus triggering quirks-mode 40/166 —
Issues were logged in the `Issues` panel in Chrome Devtools 37/166 —
Does not use HTTPS 32/166 —
Displays images with incorrect aspect ratio 22/166 —
Charset declaration is missing or occurs too late in the HTML 19/166 —
Missing source maps for large first-party JavaScript 3/166 —

SEO

SEO recommandations de Lighthouse, par pages échantillonnées concernées.
RecommandationPagesÉconomie est.
Document does not have a meta description 53/166 —
Image elements do not have `[alt]` attributes 32/166 —
Links do not have descriptive text 15/166 —
Links are not crawlable 2/166 —

Agentique (prêt pour l'IA)

Agentique (prêt pour l'IA) recommandations de Lighthouse, par pages échantillonnées concernées.
RecommandationPagesÉconomie est.
WebMCP tools registered 165/166 —
WebMCP form coverage 165/166 —
WebMCP schemas are valid 165/166 —
llms.txt follows recommendations 165/166 —
Cumulative Layout Shift 52/166 —
Accessibility tree is not well-formed 39/166 —

Ce que signifie le score Agentique

Le score Agentique (prêt pour l'IA) est nouveau dans Google Lighthouse (13.4+). Il mesure dans quelle mesure une page fonctionne pour les agents et assistants IA — les outils qui interviennent de plus en plus dans la façon dont les gens trouvent et utilisent les services publics. Il vérifie des éléments comme un fichier llms.txt (un guide lisible par machine pour les modèles de langage), des données structurées valides, un arbre d'accessibilité bien formé que les agents peuvent analyser, et des descriptions d'outils/formulaires WebMCP. Un score plus élevé signifie qu'un assistant IA a plus de chances de comprendre la page et d'accomplir correctement des tâches au nom d'un citoyen.

C'est expérimental et en évolution ; considérez-le comme un signal prospectif, pas comme une exigence de conformité. Médiane sur les pages échantillonnées : 94/100.

Lacunes trouvées sur les pages échantillonnées : WebMCP tools registered (165), WebMCP form coverage (165), WebMCP schemas are valid (165), llms.txt follows recommendations (165), Cumulative Layout Shift (52), Accessibility tree is not well-formed (39).

Résultats par page

Scores Lighthouse et Core Web Vitals par page échantillonnée (2026-W40). Agentique = score expérimental de navigation agentique. La préparation PWA / hors ligne est suivie dans l'onglet Standards (Lighthouse 12+ a supprimé la catégorie PWA). — cliquez sur un en-tête de colonne pour trier
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