Hi all, When I originally got Parallels back in Jan 2007 (2.x and 3.0 soon thereafter), it ran Vista Ultimate reasonably well on my Mac Mini with 2GB of RAM and an 80GB disk. I had it set up with 512MB memory for the VM, and an expanding hard drive on the Mac's internal hard drive. Time passed, and I needed disk space on the internal drive, so I moved the Parallels VM to an external FW400 drive. Parallels actually ran faster. My Mac Mini was upgraded to a newer Mac Mini with a Core 2 Duo processor. At some point (before 4.0), Vista started running slower and slower with piles of disk activity for any simple task, such as launching a small-footprint application. I've upgraded to 4.0, hoping for the promised performance boost. No dice. Vista was slower than ever, even with 1GB of memory allocated to it, performance optimized for the Virtual Machine and power consumption optimized for performance rather than battery life (which is odd, because there is no battery). Adaptive hypervisor is unchecked, because I'm jumping between OS's frequently. I thought that perhaps there was a performance hit by having an expanding disk, so I converted the expanding disk to a fixed-size 80GB virtual disk. I've check the defragger in Vista, and it claims that my drive was defragmented w/in the last 2 days. What do I need to be doing to get my VM to run faster? The knowledge base yields little information on this.