Core Web Vitals Check
Run Google PageSpeed Insights: real-user LCP, INP and CLS (when available) and Lighthouse lab results.
Live check made by our server to the public address you enter (rate-limited).
Field data vs lab data
Field data comes from the Chrome User Experience Report: real visitors over the last 28 days, reported at the 75th percentile. This is what Google’s Core Web Vitals assessment uses. Low-traffic pages may have none.
Lab data is a single Lighthouse run in a simulated device and network. It is useful for debugging but varies between runs.
Thresholds for “good”: LCP ≤ 2.5 s, INP ≤ 200 ms, CLS ≤ 0.1. A test usually takes 15–60 seconds. Data source: Google PageSpeed Insights API.
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