I've got latest build of PD 3.0. Recent threads show various folks reporting 50% CPU usage, etc. I find I have too. I have no idea what that means, because it doesn't make sense. Anyway, after checking XP's tasks which were only 1%, I unplugged all USB's and still made no difference. In fact, if you just start up Parallels (click icon to load it) with no VM started or even loaded yet, it starts using at least 2% and goes up to 9%. Either Activity Monitor is lying, we don't understand what we're looking at, or something "heavy" is going on behind the Parallel's scene. As an aside, the whole performance thing is just a big mystery if you ask me. I realize that there is only so much that can be said for it at some point given everybody has different configs, etc of the base machine and of parallels, but VM install issues like optimizing for the VM, and IMO the suggestions on VM RAM usage, it could be nice for more advise on these from Parallels.