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Official Google PSI Diagnostics

Core Web Vitals & PageSpeed Analyzer

Test your website's real-time performance against Google's 2026 Core Web Vitals ranking criteria (LCP, INP, CLS, TTFB) for Mobile & Desktop.

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Understanding Google Core Web Vitals Thresholds (2026 Standards)

LCP (Largest Contentful Paint)

Measures perceived loading speed. Marks the point when the main page content has likely loaded. Ideal: ≤ 2.5 seconds.

INP (Interaction to Next Paint)

Measures overall responsiveness to user clicks and taps across the entire page lifecycle. Ideal: ≤ 200 ms.

CLS (Cumulative Layout Shift)

Measures unexpected layout movement and shifts during page render. Ideal: ≤ 0.10.

Expert Help & Insights

Frequently Asked Questions (FAQ)

Core Web Vitals are a set of real-world, user-centered performance metrics that Google considers an official search ranking factor. The core metrics include Largest Contentful Paint (LCP for loading speed), Interaction to Next Paint (INP for responsiveness), and Cumulative Layout Shift (CLS for visual stability).