Serious Sam 1&2, UT, and now the UT2K3 demo all run better in OpenGL than in D3D. I assumed it was because OpenGL rendering in those games was getting priority attention from the developers. But since UT2K3 defaults to D3D with no way of changing it without manually editing the .ini, I have to assume it was given priority over OpenGL this time. But running in OpenGL looks just as good and is about 20% faster. So is D3D just slower by nature? Or are Nvidia's D3D drivers not as speedy as they should be?