Type or paste any website URL. The checker tests the live page exactly as Google's crawlers and real users see it.
Switch between Desktop and Mobile. Mobile results reflect Google's mobile-first indexing, always test mobile first.
The tool measures LCP, INP, CLS, FCP, TTFB and Speed Index, the same Core Web Vitals Google uses as ranking signals.
Get a prioritised list of issues with impact ratings. Fix High-impact items first for the fastest ranking gains.
Enter any URL below to get a full performance report including Core Web Vitals, a PageSpeed-style score and a prioritised list of optimisation recommendations.
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Enter a URL above and click Analyse Speed to get a full performance report.
Run an analysis to see your performance score.
Images are the #1 cause of slow LCP. Convert all images to WebP, add explicit width/height attributes to prevent layout shift, and use loading="lazy" on below-the-fold images.
CSS and JS in <head> block rendering. Move scripts to end of body or add defer/async. Inline only critical CSS. Use preload for fonts and above-the-fold hero images.
A CDN serves assets from servers close to your visitors, cutting TTFB by 60 to 80%. Add proper Cache-Control headers so returning visitors load your site from memory instantly.
Scores are modelled on Google's PageSpeed Insights methodology and the Lighthouse performance scoring rubric. Metrics, LCP, INP, CLS, FCP, TTFB and Speed Index, follow Google's published Core Web Vitals thresholds (Good / Needs Improvement / Poor). The overall score (0 to 100) is a weighted composite using Google's official metric weightings. Recommendations are drawn from Lighthouse audits and real-world optimisation patterns validated across hundreds of sites.
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Launch ToolCommon questions about this free tool, answered clearly.
They are Google's core speed and stability metrics, LCP for loading, INP for responsiveness and CLS for visual stability. They measure how fast and smooth a page feels to a real user.
Aim for LCP under 2.5 seconds, INP under 200 milliseconds and CLS under 0.1. Hitting these on mobile is what counts, since Google measures the mobile experience first.
Yes, but a modest one. Speed mainly helps by keeping visitors from leaving. A fast page that answers the query beats a faster page that does not, so fix speed and content together.