Why do scores change between runs?

Lighthouse is a lab test and varies with network and server load. Differences of a few points are normal; look at trends in the report history.

What counts as a good LCP?

2.5 seconds or less at the 75th percentile; more than 4 seconds is poor.

Is INP measured here?

INP comes from Chrome UX Report field data for the page or, failing that, the whole origin. Low-traffic sites may have no field data.

Website Speed Test

The test runs Google Lighthouse through PageSpeed Insights on mobile and desktop and combines lab metrics with real-user INP field data where Chrome has it. Results stay on a shareable page you can re-test later.

Results open in the site's full report, which you can share, compare and re-run.

What it checks

Mobile and desktop Lighthouse performance scores
Core Web Vitals: LCP, CLS, INP (field data) and TTFB
Lighthouse accessibility, best practices and SEO scores
Total page weight, request count and a homepage screenshot

Frequently asked questions

Why do scores change between runs?: Lighthouse is a lab test and varies with network and server load. Differences of a few points are normal; look at trends in the report history.
What counts as a good LCP?: 2.5 seconds or less at the 75th percentile; more than 4 seconds is poor.
Is INP measured here?: INP comes from Chrome UX Report field data for the page or, failing that, the whole origin. Low-traffic sites may have no field data.

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