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Get instant performance insights powered by Google Lighthouse
Core Web Vitals
Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), and Total Blocking Time (TBT)
Speed Metrics
First Contentful Paint (FCP), Speed Index (SI), and Time to Interactive (TTI)
Optimization Opportunities
Image compression, unused code, render-blocking resources, caching, and more
Performance Score
Overall 0-100 score with color-coded ratings for each metric
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What This Tool Measures
Our free website speed test runs a full Google Lighthouse audit on your page and returns the exact metrics Google uses to evaluate your site's performance. These aren't estimates — they're real measurements from a Chromium browser rendering your page.
Largest Contentful Paint (LCP)
Measures how long the largest visible element takes to render. Google considers under 2.5 seconds "good." High LCP is the #1 cause of poor performance scores.
Cumulative Layout Shift (CLS)
Measures visual stability — how much your page content shifts around while loading. A CLS above 0.1 means elements are jumping and frustrating users.
Total Blocking Time (TBT)
The total time your main thread is blocked by long JavaScript tasks. High TBT means users can't interact with your page even after it appears loaded.
Speed Index
How quickly the visible content of your page is populated. A low speed index means users see content faster, even before the page fully loads.
Why Page Speed Matters for SEO
Core Web Vitals became a Google ranking factor in 2021 and their weight has increased since. Pages with poor LCP, CLS, or INP scores are at a measurable disadvantage in search results. Beyond rankings, slow pages have higher bounce rates — 53% of mobile users leave a page that takes over 3 seconds to load.
This tool gives you the same data Google uses to evaluate your site. Fix the issues it identifies, and you improve both your search rankings and user experience.
Common Performance Issues
- Unoptimized images — Large PNG/JPEG files that should be WebP or AVIF. Often the single biggest performance fix.
- Render-blocking JavaScript — Scripts that load before the page can paint. Defer non-critical scripts to improve LCP.
- No caching headers — Static assets served without cache-control headers force browsers to re-download on every visit.
- Layout shifts from ads or images — Elements without explicit width/height cause CLS as they load and push content around.
Want a Full Website Audit?
This tool checks performance only. For a complete analysis covering SEO, accessibility, security, and domain metrics, scan your website with WebScore — free to run, with full reports available for $3 each or everything unlocked with $29.99 lifetime access.