I am surprised to find that my PB 12" 1.5GHz could import CD faster than my iMac 24". I think there must be something wrong with my iMac?? I was using the same CD and same setting: 192kps AAC vbr, error correct. My iMac get about 7.x speed but my PB is about 11.x. Any ideas? update: My iMac 24" basically import all kinds of CD at 5.x - 7.x speed.