This statistic is trotted out constantly, and I just don’t understand why. 100ms delay could be a 100% or a 1% regression in performance depending on which sit

This statistic is trotted out constantly, and I just don’t understand why. 100ms delay could be a 100% or a 1% regression in performance depending on which site you’re looking at. Are we meant to believe that we’d see the same impact on both? My other bugbear is the classic case study that some company rebuilt their stack and product, saw a perf improvement, and a corresponding revenue lift. No consideration of confounding effects (like the massive redesign that accompanied the changes) or the fact that no one shares the disasterous effects of their rebuild at a tech conference (selection bias, anyone?) Ironically it’s usually professionals in the performance community who do this. Big tech company developer advocates seem to get a little to far to the “sales” side of the picture and drop and rigour around what they’re selling.