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

166 pagina's bemonsterd door Google Lighthouse (zijn eigen headless Chrome). Scores zijn 0–100 (hoger is beter); de meetwaarden zijn Core Web Vitals. Downloaden: CSV (scores per pagina) · JSON (AI-gereed, inclusief aanbevelingen) · CSV met prioriteitspagina's · JSON met prioriteitspagina's.

Trend

Lighthouse-categoriescores over 17 weken
Prestaties Toegankelijkheid Best practices SEO W24W32W401000
Lighthouse-categoriescores per week
WeekPrestatiesToegankelijkheidBest 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.

Prestatie-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
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).

Medianen over de bemonsterde pagina's

Prestaties
82/100
Toegankelijkheid
100/100
Best practices
100/100
SEO
100/100
Agentisch browsen
94/100
Largest Contentful Paint
3.0s
First Contentful Paint
1.6s
Speed Index
4.3s
Total Blocking Time
0.2s
Cumulative Layout Shift
0.018

Aanbevelingen

Problemen die Lighthouse markeerde op de 166 bemonsterde pagina('s), naast de kopscores — gegroepeerd per categorie en gerangschikt op hoeveel pagina's ze treffen. De geschatte besparingen (overgedragen bytes of laadtijd) zijn Lighthouse's eigen schattingen waar beschikbaar. Toegankelijkheidsaudits zijn opzettelijk weggelaten; ze overlappen met de axe-core-bevindingen op de Toegankelijkheidspagina.

Prestaties

Prestaties aanbevelingen van Lighthouse, op getroffen steekproefpagina's.
AanbevelingPagina'sGesch. besparing
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

Beste praktijken

Beste praktijken aanbevelingen van Lighthouse, op getroffen steekproefpagina's.
AanbevelingPagina'sGesch. besparing
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 aanbevelingen van Lighthouse, op getroffen steekproefpagina's.
AanbevelingPagina'sGesch. besparing
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 —

Agentisch (AI-gereedheid)

Agentisch (AI-gereedheid) aanbevelingen van Lighthouse, op getroffen steekproefpagina's.
AanbevelingPagina'sGesch. besparing
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 —

Wat de agentische score betekent

De score Agentisch (AI-gereedheid) is nieuw in Google Lighthouse (13.4+). Hij meet hoe goed een pagina werkt voor AI-agenten en -assistenten — de hulpmiddelen die steeds vaker bemiddelen in hoe mensen overheidsdiensten vinden en gebruiken. Hij controleert op zaken als een llms.txt-bestand (een machineleesbare gids voor taalmodellen), geldige gestructureerde data, een goed gevormde toegankelijkheidsboom die agenten kunnen verwerken, en WebMCP-beschrijvingen van tools/formulieren. Een hogere score betekent dat een AI-assistent de pagina waarschijnlijker begrijpt en taken namens een burger correct voltooit.

Het is experimenteel en in ontwikkeling; behandel het als een vooruitblikkend signaal, niet als een nalevingsvereiste. Mediaan over bemonsterde pagina's: 94/100.

Lacunes gevonden op de bemonsterde pagina's: 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).

Resultaten per pagina

Lighthouse-scores en Core Web Vitals per bemonsterde pagina (2026-W40). Agentisch = experimentele score voor agentisch browsen. PWA-/offline-gereedheid wordt bijgehouden op het tabblad Standaarden (Lighthouse 12+ verwijderde de PWA-categorie). — klik op een kolomkop om te sorteren
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