@skematica Well for me the Air is plenty fast, and it "only" has a Core i5 at 1,6GHz. But I don't do too many heavy things on it (yet), besides transcoding video to something tolerable in h.264, which it does at pleasantly fast velocity. DVD rez stuff gets transcoded at about 3 to 4 times the real-time speed of the video, which is orders of magnitude faster than my old MacBook which had a Core2Duo at 2GHz. :)
Core i7 must really scream if this is how good the Core i5 is!
// @jextxadore