# Core Web Vitals — SEO for Developers: Technical SEO and Core Web Vitals

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

> Learn LCP, INP and CLS, Google's user-experience metrics, and how they relate to search ranking.

## The three Core Web Vitals

**LCP** (Largest Contentful Paint) — how fast the main content renders (target: ≤2.5s). **INP** (Interaction to Next Paint) — how quickly the page responds to input (target: ≤200ms; it replaced FID in March 2024). **CLS** (Cumulative Layout Shift) — visual stability (target: ≤0.1).

## Why these metrics matter

Core Web Vitals are part of Google's page experience signals. They are one input among many, and relevance still comes first, but a slow or unstable page hurts users and can hurt visibility. Monitor and optimize these metrics continuously.

## 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.