Free tool
Page Speed & Server Response Checker
Speed is a confirmed ranking factor, and time to first byte sets the floor for everything else — you cannot render faster than your server responds. This checker measures the server-side factors you can actually fix.
Free · No signup · Results in ~10 seconds
What a good response time looks like
Under 600ms is Google's guidance and under 200ms is excellent. Above 1.5 seconds is severely slow, and will cost you conversions before it costs you rankings.
The usual culprit
On database-driven sites, the single biggest win is almost always full-page caching — it commonly takes a 1,200ms response under 200ms by serving pre-built HTML instead of rebuilding every page per visitor.
Render-blocking scripts
Scripts in the head without defer or async block the browser from painting anything. Adding defer is usually a one-line change with an immediate, visible improvement.
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Related guides
Run the full 35-point audit.
Free · No signup · Results in ~10 seconds