Real Core Web Vitals, explained
Enter a URL to run Google's own performance engine on it. You'll get the Lighthouse performance score, lab measurements such as First Contentful Paint, Largest Contentful Paint, Total Blocking Time, Cumulative Layout Shift and Speed Index, and a screenshot of the finished page.
When Google has enough real-visitor data, the checker also shows field Core Web Vitals from the Chrome UX Report — the 75th-percentile LCP, INP and CLS that Google actually uses as a ranking signal — with a clear pass or fail. The top opportunities are listed with their estimated savings. Switch between mobile and desktop.
How to test page speed
- 1
Enter the URL
Choose mobile or desktop.
- 2
Wait for the test
Usually 15–40 seconds.
- 3
Check Core Web Vitals
Field data is what Google ranks on.
- 4
Work through the opportunities
Biggest savings first.
Key features
Google PageSpeed engine
The same data as Google's report.
Field and lab data
Real users and a controlled test.
Mobile and desktop
Switch with one click.
Prioritized fixes
Sorted by estimated time saved.
Common uses
- SEO audits: Check Core Web Vitals before and after changes.
- Conversion optimization: Faster pages sell more.
- Choosing a theme or host: Compare real performance.
Tips and good to know
- Lab scores vary between runs; judge trends and field data rather than a single number.
- Heavy images are the most common problem — see them with the Image SEO Checker and total weight with the Page Size Checker.