Driver is displayed in the lower right.
Choose Driver button
I use OpenGL for some computers and Direct3D for others - whatever gives the best display without artifacts and crashing. Restart GMAX to see the changes.
Then press Configure Driver button
Top section unchecked except:
Use Increcremental Scene Updates checked
Use Generalized Vertex Arrays checked
Background Texture Size - 1024 button
Download Texture Size - 512 button, and check Match Bitmap Size as Closely as Possible
Texel Lookup - Anisotropic
Mipmap Lookup - Nearest (I think that's how FS does it?)
I'm sure others have better settings; I haven't done a real study of this.