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Check LCP, FID, and CLS scores. Slow sites get deprioritized by Google AI Overviews, ChatGPT, and Perplexity.
How long until the largest element is visible. Target: ≤2.5s
How long until the page responds to interaction. Target: ≤100ms
How much the page layout shifts during load. Target: ≤0.1
Core Web Vitals scores rarely tell you what to fix. They tell you something is slow. Whether that's your hero image, a third-party chat widget, or a CSS animation that nobody asked for is left as an exercise for the reader.
This checker runs against Google's own PageSpeed Insights API — the same source that powers your Search Console reports. You get the lab numbers (Lighthouse), the field data (real users via the Chrome User Experience Report), and a prioritized list of which audits actually move the needle. We don't pretend that "Reduce unused JavaScript" is actionable advice on its own; we point at the actual heavy script and tell you what's loading it.
Worth knowing: a single Lighthouse run is noisy. The same URL can swing 20 points between consecutive runs depending on network and server load. If a score surprises you, run it three or four times before panicking. The field data is steadier — that's what Google actually uses for ranking, and it lags lab numbers by 28 days.
Run a free Core Web Vitals scan against Google PageSpeed Insights.
Enter your full website URL into the input field at the top of the tool.
Click the scan button. The tool fetches your page and runs the analysis in the background.
Review the report. Each finding includes a plain-English explanation and a recommended fix.
Implement the recommended changes on your site, then re-run the scan to confirm the issue is resolved.