Here some tweaks to improve framerate.

[sfmadmax]

My findings,
I just upgrade to a Ati 6970 today 2GB. Let me tell you. It makes a massive difference coming from a Nvidia 8800GTS . I can play 1920 with high effects and high model. and everything else is medium.

I was getting about 35-42FPS sustained flight over land. 50FPS over water.

London was still a little rough.. Jittery mostly.

I loaded both of these mods.. I'm topping out at 50FPS over land Sometimes hitting 100FPS gameplay is very very smooth. London I was getting "SMOOTH" flights at about 25 FPS , ( if you can fly london smooth at 25fps everything else should be fine )

I cranked up the detail to highest , FPS dropped as expected Everything is max settings (except AA) 25-30FPS over land. 15-20 FPS london (smooth still) 50+ fps over water


Intel W3570 (Comparable to I7 3.2)
12GB ram Vengeance DDR3 1600
ATI Diamond 6970 2GB GDDR5 (890 clock - i think)