I'm running XP on parallels on Mac Pro 2.66 with 3gb of RAM. I noticed something strange: When I start my VM from a shut down state, it boots quickly. At this point I find the VM in windows telling me it is using 180 mb or so of RAM, and Mac OS report parallels is using 200-300 mb or so of real memory in task manager. I start up MS Word, the number don't change much. Then ... I suspend the VM by quitting parallels. I restart parallels and the VM un-suspends. Look at the activity monitor, I now find parallels using 800-1100mb of "real" memory! What happened? The VM is in the exact same state it was before, yet using almost a gig more of my memory? Why? Interestingly, If I restart the VM (in windows), the mem usage goes back down.