Turn off DSP LLE on separate thread, switch to OpenGL, enable the Vertex Streaming Hack (OpenGL only), set full screen resolution to auto, and your card can handle some more AA/AF.
OpenGL is the fastest backend. If you want more speed, use one of the latest dev builds. They have some new OpenGL extensions that replace Vertex Streaming Hack for a good speed boost on Nvidia cards.
You are probably hitting a CPU bottleneck, though. SMG is a very CPU intensive game. Turning off LLE on thread might fix that problem (LLE on thread doesn't give a speed improvement since the audio backend rewrite).
OpenGL is the fastest backend. If you want more speed, use one of the latest dev builds. They have some new OpenGL extensions that replace Vertex Streaming Hack for a good speed boost on Nvidia cards.
You are probably hitting a CPU bottleneck, though. SMG is a very CPU intensive game. Turning off LLE on thread might fix that problem (LLE on thread doesn't give a speed improvement since the audio backend rewrite).