I am running Leopard 10.5.6 on a mac pro 3 Ghz. with 6 GB of RAM and it seems really sluggish. I have installed tons of applications but still have 85 GB of space left on the boot drive. It's a 320 GB -7200 RPM drive. But just for fun i created a new User Account and : VOILA ! It was 300 times faster with everything !! Where is the culprit in my Admin User Account ?? thanks for any tips !