I had a 2.4G MBP with 4G ram that I used for about a year. I bought an Intel 128GB SSD and used the optibay to install. I'm using the HD to store the home folder, and all applications and OSX on the SSD. The MBP started getting really laggy here lately, I see a pinwheel for about 60 seconds when I use "Save as" or try and print something. So I bought a 2.8G 17" MBP with 4G ram, hoping it was a hardware issue. I swapped both drives into the new MBP, but am having the same issues. I use a lot of different softwares (office '08, xcode, parallels, quickbooks, etc...) so its hard to pinpoint it down to a specific application. I am going to wipe the MBP clean and start over, but what is the best route? Should I just backup the home folder, reinstall all software then put back the home folder? I want to avoid copying the problem, but can't afford to lose all of my application data. Thanks for any advise!