Enable Dual Core, put framelimit to auto, and turn off Limit by FPS. (if thats what you still have set up)
Also, post your settings from the graphics tab
Try these:
1) Update drivers, Windows updates, DirectX Web installer (may be missing some parts), and latest version of Visual C++
2) Make sure under Power Management in Windows you're running in High Performance. Also set a high performance profile under Nvidia Control Center
3) Use the OpenGL backend on one of the latest dev builds, as it is faster than D3D. The current dev build is 4.0-780
Also, post your settings from the graphics tab
Try these:
1) Update drivers, Windows updates, DirectX Web installer (may be missing some parts), and latest version of Visual C++
2) Make sure under Power Management in Windows you're running in High Performance. Also set a high performance profile under Nvidia Control Center
3) Use the OpenGL backend on one of the latest dev builds, as it is faster than D3D. The current dev build is 4.0-780