I used to run GP4 in 32-bit colour mode, and found it slowed down heaps when going past the pits and other heavy graphic areas of the track.
Wasn't till I changed it back to 16-bit colour, that the PO is around 80% to 90% most of the time, and that's with all details on.
Can't even imagine what it'd look like with Quincunx anti-aliasing on.
By the way, what does everyone else think of the little additions to GP4 which weren't in GP3, such as the video walls, and the glowing disc brakes?
I think it's those little touches that makes it a better game than F1 2002 (or any other current F1 game).
The only thing that helps me maintain my slender grip on reality is the friendship I share with my collection of singing potatoes.