Do you have any suggestions on how to begin to decipher why PSE10 is running exceptionally slow on a Mac? I'm using OS X version 10.8.3 with 2.53 GHz Intel Core I5 and my memory is 4 GB 1067 MHz DDR3. I'm not certain that it started to get slow after installing the latest version of OS X.
Try some of the tips here to enhance performance of Editor - http://blogs.adobe.com/pselements/tips-to-enhance-photoshop-elements-p erformance/
In addtion to that, you can also use steps mentioned on blog: http://psekb.blogspot.in/2013/04/how-to-improve-pses-performance-pleas e.html