I have a realively new machine running Win7 x64. The person using this machine pretty much has to run the "compatibility mode" because certain software is not compatible with Win7 (yet). She has been complaining about the machine running slowly, and I have been digging. The Win7 machine is F-A-S-T!!! But WinXPis very slow. I was toubleshooting another problem, and I think I finally have discovered the problem... VHD disk performance - or lac thereof! I used a benchmark, and the Win7 machine's RAID5 is about 20 times faster than her pervious machines solo hard disk. However, when I run the benchmark inside the VPC for WinXP, it reports performance almost 100 times slower than her Win7 host which roughly equates to 1/3 the disk permormance of her *old* computer! Given how dependant Windows is on disk, this most certainly is a HUGE bottleneck. Question is.... What can be done about it???? Please tell me there is a "magic bullet" here! This woman has "tommorows machine today", and the software just is not ready. I know that Hyper-V on our server is a whole lot fater than this, so why is VPC is *slow*???? Help!