I'd guess that if you were to triangulate an average map it might have probably been only in the region of 1-10k triangles. Modern graphics cards on the other

I'd guess that if you were to triangulate an average map it might have probably been only in the region of 1-10k triangles. Modern graphics cards on the other hand can easily push a few million triangles every frame with decent framerates. At 10k triangles * 10 or 20 maps you could load all maps from the game simultaneously and still easily get decent fps.