Hi, My old machine was a 1GHz eMac (Radeon 7500 model) with 768MB RAM, Mac OS X 10.2.8 and Virtual PC 6.1 On this machine, I set up a Virtual PC with 384MB RAM, 16MB VRAM, no networking, no USB and no dock integration. I installed Windows XP onto a 5GB fixed size image on a defragmented drive (from using TechTool Pro 4) so that 5GB is not fragmented in any way. I then installed Service Pack 1 for Windows XP then I tweaked the windows side of things a bit for a bit more performance then I installed Virtual PC additions. Whenever I use Virtual PC, I quit everything else, even Finder for maximum performance. This system ran perfectly and when I went to System Information in Windows, it read the processor at about 535MHz each time. My new machine is a 15" PowerBook G4 with 512MB DDR333, Radeon Mobility 9700 with 128MB VRAM and a 60GB Hitachi 7200RPM hard drive. It runs Mac OS X 10.3.5 and Virtual PC 6.1.1. Processor Performance is on Highest and it is always plugged into the power when I use Virtual PC. On this machine, I set up a Virtual PC in exactly the same way as the other machine, but with 288MB RAM and Windows XP Service Pack 2, rather than 1. In this System, it seems slower and the Processor reads 285MHz in System Information. Does anybody know why this is or what I am doing wrong?