MBP 2.33 Ghz Core 2 Duo OS X 10.4.10 2 GB Ram Parallels 5120 (but problem started earlier) XP SP2, no Swapfile Sharing turned OFF 768 mb memory for Parallels When I start the windows OS my entire OS X system slows to a crawl and is largely unusable. Even cmd-tab does not work. Pageouts go through the roof, IMHO, jumping by nearly 100k until XP stabilizes. I have really done nothing to this except use it. I have another VM, win2000 that just screams along with ZERO pageouts. I have tried to do all the "tricks" and optimization that is listed here on the forum. Does anyone have any ideas on what to do here?