TL;DR
Core Web Vitals are a set of three Google metrics, Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS), that quantify real-user loading, responsiveness, and visual stability.
What is Core Web Vitals (CWV)?
Core Web Vitals are a set of three Google metrics, Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS), that quantify real-user loading, responsiveness, and visual stability.
Learn more in our how to improve Core Web Vitals guide, or work with us through our done-for-you speed optimization service.
CWV Thresholds & Benchmarks
| Metric | Good | Needs Improvement | Poor |
|---|---|---|---|
| LCP | ≤ 2.5 s | 2.5 s, 4.0 s | > 4.0 s |
| INP | ≤ 200 ms | 200 ms, 500 ms | > 500 ms |
| CLS | ≤ 0.1 | 0.1, 0.25 | > 0.25 |
How CWV is Measured
Core Web Vitals are reported from field data collected in the Chrome User Experience Report (CrUX) over a rolling 28-day window. They are also estimated in lab tools such as Lighthouse and PageSpeed Insights.