IPhoto Editing Incredibly Slow

Question

I've been using iPhoto for a while now, and have been taking lots of pictures, my library getting so big I had to move it to an external drive.
The more I edit, mostly just using Enhance and Crop, the slower it gets. Now, even outside of the editing, just when previewing (with spacebar), I can barely move from one photo to the next without getting a pinwheel for a while, and even having to restart iPhoto a couple of times.
I've tried rebuilding all of the thumbnails and cache etc, but am looking for other ideas to speed up my experience.
Thanks for your help!
Jake

Answer 1

How much free space do you have on your boot drive? It's advised to have a minimum of 10 GB of free space for optimal performance.
Some things you can do to speed up iPhoto:
1 - launch iPhoto with the Command+Option keys depressed to rebuild the library. Select the last three options.
Click to view full size
The key option here is the last one. But do all three.
2 - delete the iPhoto preference file, com.apple.iPhoto.plist, that resides in your User/Library/Preferences folder. Launch iPhoto and reset the preferences as described below.
3 - in iPhoto's General preferences turn off "Show item counts"
4 - in iPhoto's Appearance preferences do not check Outline or Drop Shadow
5 - in iPhoto's Sharing preferences uncheck all options.
6 - in iPhoto's Web preferences set "Check for new published photos" to Manually.
OT