I changed from Microsoft's Virtual XP to Sun's Virtual Box (3.1.2) running the VMLite Workstation plugin for that version with the Virtual XP software. Much improved graphic performance, no longer needed to turn off hardware acceleration and a more immediate feel to AutoCAD. As a test I even ran an Autodesk Inventor R10 on the virtual machine without problems.
One of my virtual machines keeps losing it's Cdilla license though. Can't find the difference with my other 3 virtual machines that have no problem with that other than a different set of additional programs installed for some old hardware that needs to communicate using XP. If I find a solution I will update this thread.