Thanks for your replies.
This thing happens in all me pcs, with different cpus and video cards (nvidia 970, 2070 and integrated intel) but the same os (latest version of w10).
I can confirm that unthrottle works and it's possible to force a game at , ie, 50% and, pressing F10, it would reach (but not go higher) 100%.
I have tested the last two mame versions, starting from clean configurations too.
The problem is not present in much older versions (from 1 or 2 years ago).
Another thing that I have noticed is that BGFX also blocks vertical frequency switching, for example, in D3D mode R-type switch to 55 Hz but in BGFX it stays at 60Hz. Even manually set frequency to values different from 60Hz fails.
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