Here some tweaks to improve framerate.

[FAW_FoX]

Well, thanks, didn't see your note.
So, restarted the game, on the third restart it launched the mission, but unfortunately, no FPS gains... That's weird. Am I the first with no gains ?
(I run a custom mission 12v12 above the CHannel, medium clouds, config "pretty low":
i7 720QM
GTX260 270.51 Beta Nvidia drivers
4 Go DDRIII
7x64, All Aero desactivated
"smooth" 15-22 FPS,

Effets and models are "Medium", the rest if "Low", roads and grass desactivated, 1366*768
)