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Lesson 16 / 34

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.