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Time To First Byte (TTFB)

Definition - What does Time To First Byte (TTFB) mean?

Time to first byte (TTFB) is the total time taken by the remote server to send in the first byte of data after a user requests the data or page. TTFB is tech jargon mainly used for defining or measuring the responsiveness or speed of a website or remote Web server.

Techopedia explains Time To First Byte (TTFB)

TTFB is measured by adding the complete time it takes for the browser to receive the first byte of the requested page. This time starts when the user types in a website or server’s IP address and and asks the browser to go there. The clock stops on TTFB once the first byte of information comes back to the browser. A highly responsive server with an equivalent network will have a lower TTFB time; TTFB will be higher for a low-end server with limited bandwidth.

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