Try enabling OpenMP and the Vertex Streaming hack on the version you have installed
Also:
1) Update drivers, Windows updates, DirectX Web installer (may be missing some parts), Visual C++
2) Use the OpenGL backend on one of the latest dev builds, as it is faster than D3D. The current dev build is 4.0-797
Also:
1) Update drivers, Windows updates, DirectX Web installer (may be missing some parts), Visual C++
2) Use the OpenGL backend on one of the latest dev builds, as it is faster than D3D. The current dev build is 4.0-797

