vital-scans open quality ledger

nih.gov: Lighthouse — week 2026-W38

1 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 16 weeks
Performance Accessibility Best practices SEO W25W32W401000
Lighthouse category scores by week
WeekPerformanceAccessibilityBest practicesSEO
2026-W25n/an/an/an/a
2026-W26n/an/an/an/a
2026-W27n/an/an/an/a
2026-W28n/an/an/an/a
2026-W29619596100
2026-W30449596100
2026-W31439596100
2026-W32469596100
2026-W33379577100
2026-W3434937796
2026-W35399577100
2026-W36309677100
2026-W37n/an/an/an/a
2026-W38359577100
2026-W39309577100
2026-W4035967796

History & Trends → Severity, Lighthouse and other measures across 16 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
2.1s 1/1 pages over
Avg extra weight over 1.6 MB
0.00 MB 1/348 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
35/100
Accessibility
95/100
Best practices
77/100
SEO
100/100
Agentic browsing
59/100
Largest Contentful Paint
4.6s
First Contentful Paint
2.8s
Speed Index
3.7s
Total Blocking Time
1.0s
Cumulative Layout Shift
0.483

Recommendations

Issues Lighthouse flagged across the 1 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
Minimize main-thread work 1/1 1.0s
Reduce JavaScript execution time 1/1 1.0s
Avoid multiple page redirects 1/1 0.9s
Reduce unused CSS 1/1 111 KB · 0.3s
Reduce unused JavaScript 1/1 348 KB
Document request latency 1/1 0.3s
Minify JavaScript 1/1 19 KB · 0.1s
Improve image delivery 1/1 0.1s
Initial server response time was short 1/1 0.1s
Font display 1/1 0.1s
First Contentful Paint 1/1 —
Largest Contentful Paint 1/1 —
Speed Index 1/1 —
Total Blocking Time 1/1 —
Max Potential First Input Delay 1/1 —
Time to Interactive 1/1 —
Layout shift culprits 1/1 —
Network dependency tree 1/1 —

Best Practices

Best Practices recommendations from Lighthouse, by sampled pages affected.
RecommendationPagesEst. saving
Browser errors were logged to the console 1/1 —
Uses deprecated APIs 1/1 —

Agentic (AI-readiness)

Agentic (AI-readiness) recommendations from Lighthouse, by sampled pages affected.
RecommendationPagesEst. saving
Cumulative Layout Shift 1/1 —
WebMCP tools registered 1/1 —
WebMCP form coverage 1/1 —
WebMCP schemas are valid 1/1 —
llms.txt follows recommendations 1/1 —

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: 59/100.

Gaps found on the sampled pages: Cumulative Layout Shift (1), WebMCP tools registered (1), WebMCP form coverage (1), WebMCP schemas are valid (1), llms.txt follows recommendations (1).

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
/news-events/nih-research-matters/millions-us-kids-live-parents-substance-use-disorders359577100592.8s4.6s3.7s1.0s0.483