Glossary
Core Web Vitals
Google’s three measures of how a page feels to real visitors: LCP for loading, INP for responsiveness, CLS for visual stability, judged at the 75th percentile.
Core Web Vitals are Google’s three measures of how a page feels to the people using it: Largest Contentful Paint for loading, Interaction to Next Paint for responsiveness, and Cumulative Layout Shift for visual stability. A page passes when, at the 75th percentile of visits, LCP is at most 2.5 seconds, INP at most 200 milliseconds and CLS at most 0.1, on mobile and desktop separately.
The figures that count come from real Chrome users, in the Chrome UX Report, over 28 days. A lab score such as Lighthouse’s helps you debug, but it’s not the same measure. See how to watch them across several sites.