Man this is not good. I am a very happy mac owner and recently decided to upgrade our studio workhorse to 10.6.2. The update process went flawless, the machine however felt very sluggish afterwarths. I went on this excellent board to seek some help and found a little cleaning tool that solved a lot of the problems but only left the machine slightly less sluggish. So now I completely reinstalled the machine and I am still having the feeling it is sluggish . Let me explain my setup: 8-core 3.0ghz, 4GB RAM (4 dimms, apple mem, replaced once), 4 x500gb spinpoints in a 3xdisk raid 0 volume and 1 HD for the OS. The main purpose of the machine is running Cinema4D 11.5 and After Effects CS3. There is no illegal software on the machine and everything is filed and backupped in a professional way. I know it is a bit short on RAM but for now it works nicely. Now my problem is that Expose feels sluggish meaning it takes 3 second for it to pop up and as soon as I save something I can wait for another 3-5. I closely monitor my RAM through istat and I know everything will grind to a halt if it comes above 71% total memory usage, in my case this always happens. It feels like there is a permanent After Effects render running! I don't know what to do because I already reinstalled the OS to a formatted HD. I hope this excellent community is able to answer my questions. Thanks! edit: As a comparison I tried our core duo imacs that are running on 10.6.2 too and they feel 5 times faster!