I didn't see or notice any difference with VSYNC forced on or forced off. You're all high, I'm thinkin - faster load times = get a console!
You don't have to do Alt Tab...just click with the mouse or hit the Esc button to get through some of the loading screens. Menus are FAST! As far as loading maps/races...i see about 30 - 40 seconds from track select to countdown race begins.
Seems normal to me. System is nothing special.
XP PRO
Pentium 4 3.4 GHz
nVidia 7800 GTX drivers dated 12/5/2007 169.21
2 GB RAM
HD Audio