core-web-vitals
Installation
SKILL.md
Core Web Vitals
The three stable Core Web Vitals, each measured at the 75th percentile of real page loads (segmented by mobile and desktop):
<quick_reference>
| Metric | Measures | Good | Needs Improvement | Poor |
|---|---|---|---|---|
| LCP — Largest Contentful Paint | Loading | ≤ 2.5 s | 2.5–4.0 s | > 4.0 s |
| INP — Interaction to Next Paint | Interactivity | ≤ 200 ms | 200–500 ms | > 500 ms |
| CLS — Cumulative Layout Shift | Visual stability | ≤ 0.1 | 0.1–0.25 | > 0.25 |
A page passes Core Web Vitals only if all three metrics meet "Good" at the 75th percentile.