Page speed checker with Core Web Vitals
Test how fast a page loads on mobile and desktop. See Core Web Vitals (LCP, INP, CLS) from Google CrUX real Chrome users with a pass or fail, a Lighthouse lab test from Google PageSpeed Insights, and the top fixes in plain English, plus our own quick server check.
How to use the Page Speed Checker
- 1Enter the page address and choose Mobile or Desktop.
- 2Read the Core Web Vitals from real Chrome users (when Google has enough visits) and whether the page passes.
- 3Check the Lighthouse lab score and metrics, then work through the top things to fix, biggest saving first.
- 4Look at the basic check for server response time, page size, compression and caching headers.
Frequently asked questions
What are Core Web Vitals?
Three measures of real user experience that Google uses in ranking: Largest Contentful Paint (loading, good under 2.5 s), Interaction to Next Paint (responsiveness, under 200 ms) and Cumulative Layout Shift (visual stability, under 0.1).
What is the difference between field data and lab data?
Field data is from real Chrome users over the last 28 days (Google CrUX) and is what Google ranks on. Lab data is one simulated load (Lighthouse) that's great for finding what to fix but changes from run to run.
Why is there no real-user data for my page?
Google only publishes CrUX data for pages and sites with enough Chrome visitors. Smaller sites often have none, or only site-wide (origin) data; the lab test still works.
Why is my mobile score lower than desktop?
The mobile test simulates a mid-range phone on a slow 4G connection, so heavy scripts and images cost far more time. Most of your visitors are probably on mobile, so that score matters most.
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