From my test, this build made a great leap in speed on an (Intel) Mac Mini. The program loads quicker, shuts down quicker too. Graphics and moving windows around in coherence mode is about the same with a small bit of lag time. Still not as fast as Fusionware's. I put the Windows menu bar at the top of the screen where it is out of the way. One thing I tried was Internet Explorer. IE for Windows using Parallels runs faster then Safari for my Mac. Although the page I was rendering may have been built for IE. On a particular aviation weather website the radar image in IE is displayed instantaneously, while in Safari I can see it draw the picture in about a second. Thought it was unique that the virtualization browser was quicker then the native one. I just wish that Parallels supported dual core not just single. I have been told it is planned.