Peter Sevcik and Rebecca Wetzel write in their App Performance View blog: "Acceleration-vendor marketing departments push out a huge body of misinformation every day. You have read the headlines: "We speed up your application response time 400X!" ... Take an example in which the base (pre-acceleration) response time for an application task (the time from when the user hits enter to when the screen refreshes) is 8 seconds. When the acceleration technique is applied to the application-traffic flow, the same task now takes 2 seconds. The 6-second difference is a very respectable improvement which many users will notice... .The incorrect approach [to calculate the improvement] is to divide the base (8) by the new time (2), yielding a number greater than 1, which in this case is 4. Mathematically this result does not tell you how much faster the time is with the device, but rather how much slower the time would be if you stopped using the device."
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