-nosrgb : disables SRGB (limits variety of colors) results in flatter/smoother colors, and brighter lighting
-nouserclip : disables user clip planes and enables fast clipping (I experienced a fps boost with this)
-nops2b : uses pixel shaders 2.0 instead of 2.0b, reduces fps impact of some shaders
-softparticlesdefaultoff : disable depth blending for particles and sprites

https://gtm.you1.cn/games/648120/Avatar/Preview/0