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What Are Core Web Vitals? LCP, INP and CLS Explained

Core Web Vitals are Google's metrics for loading speed, responsiveness and visual stability.

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Core Web Vitals

Core Web Vitals are three Google metrics that measure real users’ experience of a page: Largest Contentful Paint for loading, Interaction to Next Paint for responsiveness and Cumulative Layout Shift for visual stability.

The thresholds

Metric Measures Good
Largest Contentful Paint (LCP) How quickly the main content appears 2.5 seconds or less
Interaction to Next Paint (INP) How quickly the page responds to input 200 milliseconds or less
Cumulative Layout Shift (CLS) How much the layout jumps while loading 0.1 or less

Source: web.dev (web.dev: Web Vitals)

Core Web Vitals: fast website in a browser window with Core Web Vitals gauges for LCP, INP and CLS all in the good range

Why they matter commercially

See why speed costs customers and web development.

FAQ

Are Core Web Vitals a ranking factor?
They are part of Google’s page experience signals. Relevance matters more, but speed always affects conversion.
How do we measure them?
PageSpeed Insights and Search Console show real-user data for your pages.
Published Sep 30, 2026 · Last updated Sep 30, 2026