Core Web Vitals: The Complete Guide to Page Experience

Understand LCP, INP, and CLS - the metrics Google uses to evaluate page experience. Learn how to measure and improve each metric.

Core Web Vitals are performance metrics that measure real-world user experience. Google uses them as ranking signals.

The Core Web Vitals

How to Improve LCP

How to Improve CLS

Metric	Measures	Good	Poor
LCP	Largest content paint	Under 2.5s	Over 4.0s
INP	Interaction to next paint	Under 200ms	Over 500ms
CLS	Cumulative layout shift	Under 0.1	Over 0.25

Frequently Asked Questions

What replaced FID with INP? +

Google replaced FID with INP in March 2024. INP measures latency of ALL user interactions throughout the page lifecycle, not just the first one.

How do I measure Core Web Vitals? +

Use Google PageSpeed Insights, Chrome DevTools, Lighthouse, or the Web Vitals JavaScript library for real-user data.

Do Core Web Vitals really affect rankings? +

Yes. Google confirmed they are a ranking factor, especially in competitive SERPs where other factors are equal.