Core Web Vitals
Core Web Vitals are a set of three Google metrics — Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) — that measure real-world user experience.
Google uses Core Web Vitals as a ranking signal. LCP measures loading performance (target: under 2.5s), INP measures interactivity (target: under 200ms), and CLS measures visual stability (target: under 0.1).
These metrics are collected from real Chrome users via the Chrome User Experience Report (CrUX). Lab tools like Lighthouse estimate them, but field data is what Google uses for ranking.
Optimize LCP by preloading critical resources and using responsive images. Reduce INP by minimizing main-thread work and breaking up long tasks. Fix CLS by setting explicit dimensions on images and avoiding dynamic content injection above the fold.
Related terms
Page Speed
Page speed is the measurement of how quickly a web page's content loads and becomes interactive, typically measured by metrics like Time to First Byte (TTFB), First Contentful Paint (FCP), and Largest Contentful Paint (LCP).
Mobile-First Indexing
Mobile-first indexing means Google predominantly uses the mobile version of a website's content for indexing and ranking, rather than the desktop version.
Technical SEO
Technical SEO encompasses the server-side and infrastructure optimizations that help search engines efficiently crawl, render, index, and rank your website's content.
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