Performance Checker
Performance Checker
Choose a device, then test how a specific page loads or explore recent experience from visitors across the website. One result describes a single test; the other summarizes visits over time when enough data is available.
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Lab audit: investigate one page
Select Lab audit to run a Lighthouse test through PageSpeed Insights (PSI) for the page URL you enter under simulated mobile or desktop conditions. Review its performance score, load metrics, screenshots and checks that may point to areas for improvement. Any SEO checks cover a limited set of basics on that page, not a complete sitewide SEO audit.
Field data: see real-user experience
Select Real-user data to see available Core Web Vitals from the Chrome UX Report (CrUX) for the website origin across a recent period. These values reflect eligible visits across the origin, not just the page URL you entered. Sites without enough observations may have no result; missing CrUX data is a normal possible outcome.
Why can the results differ?
A one-time page test and a summary of many visits answer different questions. They can differ because the people, devices and conditions behind them differ. Read each result with its scope and measurement date before comparing values.