This is what I'm doing to optimize my graphics.
--- edit --- I changed the file and the new rev has a diff link ---
You can d/l this if you want...
The tests were all done using the Free Flight - Air Start mission. That provided a consistent scenario, vs. a Road Kill.
I have a few more settings to try out tomorrow. I'm running an EVGA GTX 580 -AR 1920 x 1200, 30", 59Hz, Dell 3008 WFP.