Response Time Checker / Glossary
Server-Timing
A response header in which the server reports its own timings, for example Server-Timing: db;dur=53, render;dur=12. Browsers show it in developer tools, and our checker lists it next to the measured phases.
How we measure it
We parse the Server-Timing header of the final response.
What good looks like
Present on the main pages, with the phases that matter to you (database, cache, application).
How to improve it
- Most frameworks have middleware for it; Cloudflare adds its own cfRequestDuration entry.
Measure your site
Three cold samples, every phase, and a diagnosis of what is slow.
Open the Response Time Checker