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Core Web Vitals

A set of Google metrics that measure real-world user experience on web pages: loading (LCP), interactivity (FID/INP), and visual stability (CLS).

Core Web Vitals are a set of performance metrics defined by Google that measure the real-world user experience of a web page. They are used as ranking signals in Google Search.

The three Core Web Vitals are: Largest Contentful Paint (LCP), which measures loading performance; First Input Delay (FID) or Interaction to Next Paint (INP), which measures interactivity; and Cumulative Layout Shift (CLS), which measures visual stability. Google recommends: LCP under 2.5 seconds, INP under 200 milliseconds, and CLS under 0.1.