How fast does your page respond?

Measure TTFB, response size, compression and the full redirect chain — straight from the server

Single-request HTTP probe No account required
What gets measured TTFB Transfer size Compression Redirect chain CDN detection

Why TTFB matters

Time-to-first-byte is how long the server takes to start responding. Under 200ms is fast, over 800ms means visitors are waiting before anything renders.

What gets measured?

TTFB, total transfer time, response and HTML size, compression algorithm, redirect chain length, server, CDN and HTML metrics — in one request.

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Beyond the probe

This is a synthetic single-request probe — useful for catching obvious regressions. For real-user metrics, combine with field data from Chrome UX Report.

Read the docs →