What are Core Web Vitals?

Core Web Vitals are Google’s key page experience metrics: LCP (loading), INP (interactivity), and CLS (visual stability).

What are the thresholds?

Good: LCP < 2.5s, INP < 200ms, CLS < 0.1. Needs improvement: LCP 2.5–4s, INP 200–500ms, CLS 0.1–0.25. Poor: above those values.

This tool uses Google PageSpeed Insights API, combining Lighthouse lab data and Chrome UX Report field data when available.

Diagnostic workspaceSite Audits

Good: LCP < 2.5s, INP < 200ms, CLS < 0.1. Needs improvement: LCP 2.5–4s, INP 200–500ms, CLS 0.1–0.25. Poor: above those values.

This tool uses Google PageSpeed Insights API, combining Lighthouse lab data and Chrome UX Report field data when available.

Analyze performance with Google PageSpeed Insights API

This advanced check uses Google PageSpeed Insights API. Sign in to run audits and control quota.

Website URL

Device type

Good - Great user experience

Needs improvement - Optimization opportunity

Poor - Needs attention

Uses Google PageSpeed Insights API (lab + field data when available). Sign-in required.

Enter a URL and run the audit

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