Hello - longtime lurker, first post here. I just upgraded from a 2006 iMac to the the new i5 27" and expected to see a major improvement over Aperture's performance..and am currently very disappointed because I am still getting the beach ball. Perhaps someone can make some suggestions for me? I migrated everything via Time Machine restore. Most of my photo library (50,000 files - RAW and edits) is referenced on a 7200 rpm firewire 800 Lacie drive. I tried regenerating thumbnails and updating previews but didn't really want to have to reprocess the masters unless I really had to. I planned to upgrade my RAM from 4 gb after I saw how it performed...but really didn't expect it to be this slow. I honestly thought I would be blown away by the improvement over what I had. I guess I can try moving the masters to the computer itself, in case the external drive is the bottleneck, but I do prefer a referenced library. (Looking forward to thunderbolt drives!) Does anyone have any suggestions? Thanks in advance (and for past info.) PS I was on the fence about getting the i7 but the Apple salesman actually talked me out of it, since (heavy) photo editing its the most intensive thing I do. Would that have made a difference?