TTFB doesn't mean what you think it means
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Time-To-First-Byte (TTFB) is a popular performance metric, yet there are many problems and nuances with it. It has a variety of divergent definitions and tools often measure it in (slightly) different ways. In this talk, we'll explore how and why this can be a problem in practice, especially when comparing TTFB numbers from different sources (such as CrUX, RUM and synthetic measurements). You'll walk away with a better idea of how to deal with TTFB discrepancies, as they're sure to show up!
Robin Marx (he/him) is a Web Performance Architect at Akamai Technologies. His main expertise is in network protocol performance, including HTTP/3 and QUIC, which was the topic of his PhD research. YouTube videos of Robin are either humoristic technical talks or him hitting other people with longswords.
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