Managing large image libraries in iPhoto 2
Derrick Story provides guidence on How to Manage Large Image Libraries with iPhoto 2, which has been a problem for many. Large in this case is a Gig (GB) or more of images.
I found that closing the rolls in iPhoto 2 made the speed of iPhoto greatly improve.
To get the film rolls, go to view and check film rolls. This will close the view every image view and should make your iPhoto much faster. I now have over 1300 photos in iPhoto and it is back to being usable, as far as speed is concerned.