Well I wasn't expecting that! Aero performance on my Dell laptop on RTM Vista seemed clunky (especially the Windows Tab application switching). In fact my recollection of my old Acer Ferrari running a Vista Beta was definitely better.
So I thought I would go to the Video Drvier panel and click the button to upgrade the driver. It found a driver and applied it. I re-ran the "Performance Information and Tools" panel to update my Windows Experience Index and it had dropped a point on Video Performance - see below for yourself!
I will keep checking back to see whether this improves...
Before (see how it knows my system has changed):
After:
