Core Web Vitals Test

Real browser metrics (lab data plus real-user data where available) powered by Google PageSpeed Insights. Takes 15 to 40 seconds.

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Terms explained

CSSResponsive DesignCritical CSSCSS AnimationFront EndHydration

Frequently asked questions

What are Core Web Vitals?

Google user-experience metrics: LCP (loading), CLS (visual stability) and INP (responsiveness). Good scores: LCP under 2.5 s, CLS under 0.1, INP under 200 ms.

Why is lab data different from real-user data?

Lab data is one simulated test. Real-user (field) data comes from Chrome users over 28 days and is what Google uses for ranking.