Latency & TTFB Test

Repeatedly GETs this page from the server and measures time-to-first-byte and latency.

Interval (ms) Duration (s)

Ready.

Latency per request (ms)

Latency = responseStart − requestStart: request sent → first byte back. On the kept-alive connection this is one round trip plus server time.
TTFB = responseStart − startTime, including any DNS / TCP / TLS setup.
Must be served over HTTP(S). Automation: ?interval=200&duration=60&auto=1, or await speedTest.run({ interval, duration }).