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However, some applications have relatively well-defined "physiological" bounds beyond which the responsiveness feeling vanishes. For example, for voice conversations, a (round-trip) delay of 150ms is practically unnoticeable, but an only slightly larger delay is typically felt as very intrusive.
RPM is a recent attempt at defining a consumer-oriented metric for responsiveness that reflects actual network usage and performance experience.
– Simon Leinen – 2008-04-07 – 2021-09-12– Main.SimonLeinen - 07 Apr 2006 - 23 Aug 2007