# Core Web Vitals — SEO for Developers

Source: https://www.geekswithgeeks.com/en/seo-developers/seo-core-web-vitals

> Master LCP, FID, and CLS — Google's key metrics for user experience and ranking.

## The three Core Web Vitals

**LCP** (Largest Contentful Paint) — how fast your page renders (target: <2.5s). **FID** (First Input Delay) — how responsive the page is to user input (target: <100ms). **CLS** (Cumulative Layout Shift) — visual stability, e.g., no jank or jumping buttons (target: <0.1).

## Why these metrics matter

Google uses Core Web Vitals as ranking signals. Sites with poor vitals rank lower. A slow page doesn't just frustrate users; it hurts SEO. Developers must monitor and optimize these metrics constantly.

## Monitor with PageSpeed Insights

Use Google's PageSpeed Insights tool to measure your Core Web Vitals. Test real user data (CrUX) and get actionable optimization recommendations.