if you listen to live unamplified music, the playing exhibits a tempo, and within that structure the individual notes may vary. for example, in 4/4 time, there are 8th notes, quarter notes, etc.
if a composition takes 10 minutes, there is a sense of pace based upon the markings. thus, for example, adagio, presto, etc. .
musicians play can play fast or slow. once it is recorded the tempo is set and the timing is set. if you play a recording on 5 stereo systems, the tempo is still the same and the elapsed time is also the same.
if you are talking about perception, that depends upon the listener.
i think the concept is a construct used by audiophiles but has no value as to communication.
i would like to hear a demonstration of this concept. any suggestions ?