Core Web VitalsCWV

Core Web Vitals are the three field metrics Google uses to quantify real-world page experience: Largest Contentful Paint for loading, Interaction to Next Paint for responsiveness, and Cumulative Layout Shift for visual stability. They are part of the broader page-experience signals and are measured on real users through the Chrome User Experience Report, not only in lab tools.

The current good thresholds are: LCP at or under 2.5 seconds, INP at or under 200 milliseconds, and CLS at or under 0.1, each measured at the 75th percentile of page loads across mobile and desktop. INP replaced First Input Delay as the responsiveness metric on March 12, 2024, which raised the bar because INP captures the latency of every interaction, not just the first.

CWV is a real but modest ranking input; it is a tiebreaker among comparable pages, not a substitute for relevance and authority. Its larger value is honest: fast, stable pages convert better and are read more completely by both users and crawlers. We report lab data from Lighthouse and field data from CrUX separately, because they answer different questions, lab tells you what is technically possible, field tells you what your users actually experience.