My MBP is one of the original intel ones I believe.. It's a 2.0GHz core duo, 100gb HD with 2gb ram(that's max), and by editing I do mean fairly heavy Photoshop and lightroom. iPhoto stuff it handles with zero problems although I don't use iPhoto. File sizes are about 12mb out of the camera and after just a few layers it starts to give me the wheel. The iMac is fine editing photos for the most part, it's usually when I'm doing several things at once that it did it... I did install some crucial ram yesterday(from 2 to 4gb) and was in able to get the wheel when I tried yesterday... It might be just in my head but it seems as if everything responds faster now, even when there's not a heavy load on it. I was under he impression though that if I was not using the full 2gb of ram that I wouldn't notice the difference of more ram...??