asking for a friend who is trying to figure out if he can get away with an MBA over an MBP. has new baby, new camera, expects to take many photos.
Going by the Apple forums, I'm under the impression that iLife is single core only. Although I'm no where near certain.
Edit: Playing around with a 3880*2800 photo with activity monitor and the floating CPU window open, all four cores show increased activity but the third core spikes around twice as high - not sure what that means. Didn't get over 18% CPU usage throughout. The four logical cores, hyper threading, show no activity.
Hope someone can expand on this further.