I've successfully used PSE 9 on my Mac Pro since it came out. It suddenly started going slow as molasses. It loads normally but after that, i get the beach ball and any action takes up to 60 seconds! I think there is plenty of disk space and available ram. (Im not an expert here). My other apps are behaving normally. I've tried uninstalling, then reinstalling to no avail. Any suggestions out there? Please...
Go to your username>library>preferences and delete:
Adobe Photoshop Elements 9 paths
Adobe Photoshop Elements 9 settings
That library is hidden in 10.7 and 10.8. To see it, option-click the Go menu in the Finder and it will appear below the little house for your user account. While you're in there, if using 10.7 or 10.8, go to Saved Application States and delete any for PSE.
Repair permissions and try again.