Response Time Checker

Measure the response time and time to first byte (TTFB) for any URL from the server.

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Frequently asked questions

What is TTFB?
TTFB (Time To First Byte) is the time from making an HTTP request until the first byte of the response is received. It measures server processing time plus network latency and is a key web performance metric.
What is a good TTFB?
Under 200ms is excellent, 200–500ms is acceptable, 500ms–1s is slow, and over 1s is poor. For a good Core Web Vitals score, aim for TTFB under 800ms.