I currently have a new iMac 27" i7 with 8 gigs of memory. Working with Canon 5D MK II full RAW files (about 1200 images) the images load incredibly slow when going from one image to another. It takes 5-7 seconds for each image to load. This doesn't happen to my 3 year old Mac Pro. Anyone know if I have a setting in Aperture that slows it down? Thanks!