I notice no change in video performance. However, I did get a TOTAL Mac freeze with the beta, when I tried to update VMWare Tools from the taskbar. It stopped inthe middle and I had to do a hard reset of the Mac. (Oddly enough, the only thing I COULD do during the freeze was move the mouse--which showed a Windows cursor even when mousing over Mac windows. But it would not respond to anything. I was able to sleep and wake, but instead of the usual wake-from-sleep password dialog, I got a Windows cursor over black.)
Next time I tried updating from the Mac menu bar instead, and for whatever reason that was fine.