Time To First Byte

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Time To First Byte or TTFB is a measurement that is often used as an indication of the responsiveness of a webserver or other network resources.

It is the duration from the virtual user making an HTTP request to the first byte of the page being received by the browser. This time is made up of the socket connection time, the time taken to send the HTTP request, and the time taken to get the first byte of the page. This can be measured using Microsoft's Application Center Test (ACT).

Other uses[edit]

TTFB can also stand for 4,5,6,7-tetrachloro-2-trifluoromethylbezimidazole, a mitochondrial respiratory chain uncoupler.