Website speed test
Run a Google Lighthouse performance check for a mobile or desktop page.
Uses external dataWhat you need and when to use it
Finding performance work to prioritise. Have ready: A public page URL and device choice.
Check a public page
Google runs a Lighthouse lab test for the device you select. This can take around 30 seconds; availability depends on Google’s service and its usage limits. Successful measurements may be reused for 15 minutes; the result shows when they were fetched.
HOW TO READ THE RESULT
One lab test is a snapshot. Results vary, and this tool does not measure competitors or certify real-user Core Web Vitals.
Turn a finding into a next step.
Discuss the website issue or project scope highlighted by this tool.
Discuss your next step