core-web-vitals
Installation
SKILL.md
Core Web Vitals — Technical SEO
Based on Google's CWV specification and field observations across WordPress, PrestaShop, and Shopify sites. Official reference: https://web.dev/explore/metrics
Thresholds and scoring
| Metric | Good | Needs improvement | Poor |
|---|---|---|---|
| LCP | ≤ 2.5s | 2.5s – 4.0s | > 4.0s |
| CLS | ≤ 0.1 | 0.1 – 0.25 | > 0.25 |
| INP | ≤ 200ms | 200ms – 500ms | > 500ms |
| TTFB | ≤ 800ms | 800ms – 1800ms | > 1800ms |
Pass threshold for Google ranking signal: 75% of page loads must be in the "Good" range. Measured at the page URL level (not site average).