Linux NVidia performance culprits?
Found 2 settings that can give a large fps boost (I'm using an NVidia GeForce GTX 295)
I was messing around with the settings and I noticed something a bit interesting with the "GPU speed" setting.
If I let the game autodetect my settings I would get about 22FPS, I tried lowering the 3 settings 1 at a time and found that "CPU speed" and "GPU memory" only had very little change on FPS.
"GPU speed" also had very little change UNTIL I moved from "low" to "lowest" there was a HUGE fps increase. From about 25fps up to more like 70 - 100fps.
So I set it on "low" and then manually edited each of the "custom" settings 1 by 1 and I found the there are 2 settings in there that seem to make the largest difference for me.
1) enable "no dynamic lighting"
2) disable "shadow blur"
In conclusion, if I then allow the game to auto-detect my settings and ONLY change those 2 options, the performance goes from 22fps to around 60fps
and it still looks great!
Hopefully this helps someone.