Core Web Vitals
Google's field metrics for loading, interactivity and visual stability.
SEO
Definition
Core Web Vitals are three field-measured metrics: Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness) and Cumulative Layout Shift (visual stability).
They are collected from real Chrome users and reported in the Chrome UX Report and Search Console.
Why it matters
They are a confirmed ranking input and, more importantly, a direct conversion input — slow, unstable pages lose revenue before they lose positions.
How to apply it
- Target LCP under 2.5s, INP under 200ms and CLS under 0.1 at the 75th percentile.
- Reserve explicit width and height on every image and embed.
- Server-render above-the-fold content and defer non-critical scripts.