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Test any URL for Core Web Vitals and get a performance score with actionable suggestions to improve speed.
Powered by Google PageSpeed Insights API. Analysis may take 15-30 seconds.
Enter a URL above to test its performance and Core Web Vitals.
Comprehensive performance insights powered by Google Lighthouse.
Measure LCP, CLS, TBT, FCP, Speed Index, and Time to Interactive.
Test both strategies with one click to compare performance.
See your 0-100 score with color-coded results at a glance.
Get specific opportunities to improve speed with estimated savings.
Powered by Google PageSpeed Insights API — the same engine behind Lighthouse.
We don't store your URLs or results. Each analysis runs fresh.
Common questions about page speed and Core Web Vitals
Core Web Vitals are a set of metrics Google uses to measure real-world user experience: Largest Contentful Paint (LCP) measures loading, Cumulative Layout Shift (CLS) measures visual stability, and Interaction to Next Paint (INP) measures responsiveness.
Mobile scores are typically lower because the Lighthouse mobile audit simulates a mid-tier phone on a slow 4G connection. Desktop uses a faster simulated environment. This reflects real-world conditions for many mobile users.
The score is a weighted average of several metrics: LCP (25%), TBT (30%), CLS (25%), FCP (10%), and Speed Index (10%). Each metric is scored based on Lighthouse performance scoring thresholds.
Performance analysis can vary due to network conditions, server load, third-party scripts, and other factors. Running multiple tests and averaging results gives a more reliable picture.
No. We proxy the request to Google's PageSpeed Insights API and return the results directly. We don't log, store, or cache any URLs or performance data.
We build high-performance web applications, optimize Core Web Vitals, and help teams ship fast, reliable software.
Disclaimer: This tool is provided for informational and educational purposes only. Preview renderings are approximations and may differ from actual platform displays due to platform updates, caching, or rendering differences. We fetch publicly available metadata and do not store or share your URLs. Platforms may cache old data even after you update your content—use their official debug tools to refresh caches. ZIRA Software is not liable for any decisions made based on this tool's output.