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Glossary · Core Web Vitals

Core Web Vitals

Google's user-experience metrics: Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS).

Core Web Vitals are page-experience metrics Google uses as a ranking signal. LCP measures loading speed, INP (which replaced FID in 2024) measures interactivity, and CLS measures visual stability.

Targets for "good": LCP under 2.5s, INP under 200ms, CLS under 0.1. Sites measurably exceeding these targets see ranking improvements; sites failing them see ranking penalties on mobile-first results.

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