Framerate optimizations in the trunk, R2256+

[FFuser]

It give an increase for me too:

Kyalami
30-40 FPS With optimizations (drops once to 25 FPS)
25-36 Without (drops once to 20 FPS - at the same place as above)

Note that my settings are rather low (distance level low) because I have a bad graphics card:

intel i915 / 945 GM
Processor: intel Core 2 Duo (2.16 Ghz) 64-bit

Note that I ran in single threaded mode:
multithreaded crashes on me:

INFO: Multithreading initialized
vdrift: i915_vtbl.c:344: i915_emit_state: Assertion `0' failed.
SIGABRT detected, releasing the mouse
Terminated