I know that Aperture 3 is by far the more full featured of the the two, but when I did the free trial of Aperture 3, it seemed to move so much slower then my iPhoto to the point where I said "forget it." I have a library of about 50 gigs of pictures. I am not talking about the crazy long period of time it took to turn my Iphoto library into an Aperture Library, but the time it took to actually open up Aperture 3 and use it after I got it all set up. I just gave up and uninstalled Aperture 3. Has anyone else noticed a similar slowdown in performance for Aperture 3 vs iPhoto?