This is a post that some folk may find helpful if they're running hyper-v and finding the machine gets a bit laggy at certain times. My original post is here:http://www.win2008workstation.com/forum/viewtopic.php?f=6&t=357
There's an open thread about this issue on TechNet at:http://social.technet.microsoft.com/forums/en-US/winserverhyperv/thread/4e1c53f5-0400-4ca9-8819-f942c10881c1
Consensus seems to be that the problem may be certain 64 bit video drivers. So far no-one from MS has responded.
Just so you all know.