TTFB (Time To First Byte)

Time to First Byte, often in the acronym TTFB, is a measure that indicates the time it takes for a browser to receive the first byte of data from the Web server after sending an HTTP request.

This metric is an indicator of server response speed and can be affected by several factors, including server configuration, processing power, network bandwidth, and geographic distance between the server and the user.

Generally speaking, a low TTFB is desirable because it suggests that the server is able to begin content delivery quickly: concretely, it indicates that a website is faster, which can contribute to a better user experience and potentially better ranking in search engine results.