Ok, I know we usually use the intro, but I've noticed something recently. I reinstalled the game without any mods/skins etc. And gained quite a bit of speed in single player games. I was able to raise the resolution one notch, and keep the same FPS. However, this didn't effect the fps of the flyby intro.
If anyone knows where to get the file Gev was talking about, let me know, because I don't know that the flyby is that good of a benchmark.