Product → Web Applications
TTFB
The elapsed time from initiating a request until the first response byte becomes available.
TTFB
Time to First Byte (TTFB) measures the delay between starting an HTTP request and receiving the first response byte. It includes connection setup, network travel, queueing, and server processing.
Use TTFB to investigate origin latency, cache effectiveness, geographic distance, connection setup, and backend contention. It does not by itself represent complete page loading speed.