> Check Tafoid's response to me- in my case, at least for OpenGL since D3D was fine for
> me, it was in the "Manage 3D Settings" section of the NVIDIA Control Panel software.
> I just changed Vertical Sync from "use the 3D application setting" to "off" and
> clicked "Apply." Problem solved.
Bingo! That did it, thanks.
mame64 pacman -nothrottle -str 30 -video d3d
Average speed: 2250.57% (29 seconds)
mame64 pacman -nothrottle -str 30 -video opengl
Average speed: 4678.96% (29 seconds)
mame64 pacman -nothrottle -str 30 -video bgfx
Average speed: 839.93% (29 seconds)
i7-6700K, GTX 960, Windows 10 x64