Free site speed tester with Core Web Vitals.
Test any public page for mobile or desktop performance. See your Lighthouse score, Largest Contentful Paint, layout shift, blocking time and the biggest opportunities to make the page faster.
Test page speed
Powered by the Google PageSpeed Insights API. Tests can take up to a minute.
The metrics this speed test reports.
Core Web Vitals are Google page-experience signals, and speed also affects conversion.
Loading
Largest Contentful Paint (LCP) measures when the main content becomes visible. Good is 2.5 seconds or less.
- LCP and FCP
- Speed Index
- Real-user LCP when available
Interactivity
Interaction to Next Paint (INP) is the field metric for responsiveness. Total Blocking Time is its lab proxy.
- TBT in lab data
- INP from field data
- Main-thread blocking
Visual stability
Cumulative Layout Shift (CLS) measures unexpected movement as the page loads. Good is 0.1 or less.
- CLS lab and field
- Top opportunities
- Estimated time savings
Three steps to useful results.
Enter the URL
Use a public page. Test your homepage and a few key templates such as a service or product page.
Choose a device
Google ranks mobile-first, so start with mobile, then compare desktop.
Fix the top items
Start with the largest opportunities, usually images, render-blocking files and server response.
Read our guide
Site Speed Tester FAQ
Common questions about this tool and what the results mean.
Ask us about your resultsWhat is a good Core Web Vitals score?
Aim for LCP at or under 2.5 s, INP at or under 200 ms and CLS at or under 0.1, measured at the 75th percentile of real visits.
Why do results change between tests?
Lab tests run on simulated devices and networks, so small variations are normal. Look at trends and the largest opportunities rather than single-point differences.
Does page speed affect rankings?
Speed is part of Google page-experience signals, and slow pages also lose visitors. It rarely outweighs relevance, but it can be a tiebreaker and improves conversions.
Why does the test say there is no field data?
Google reports real-user data only for URLs with enough Chrome traffic. Low-traffic pages often have none.
Want an expert to fix what the tool finds?
Our team turns diagnostics into a prioritized roadmap and does the work. Start with a free audit request.