When doing any type of performance testing, whether it be production monitoring, load testing, stress testing, or simple performance tuning, one of the most important data metrics is the Time to First Byte (TTFB). As the name implies, TTFB is the amount of time it took for the client (usually a web browser) to receive the first byte in a given request. While the total time it took to download the object (ie: Time to Last Byte – TTLB) is also important, the TTFB usually tells a more important story, especially when it comes to software layer optimizations.
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