My system apparently favors D3D (Intel Core i5-4570, GTX 970, Win10 x64):
mame64 pacman -nothrottle -str 30 -video d3d Average speed: 4430.15% (29 seconds)
mame64 pacman -nothrottle -str 30 -video opengl Average speed: 197.96% (29 seconds)
mame64 pacman -nothrottle -str 30 -video bgfx Average speed: 573.56% (29 seconds)
Ran twice with similar results. I remember nvidia GPUs once favored OpenGL, but I guess that was awhile ago.
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