Have just downloaded the 2017-8-5 nightly window x86/x64 build and with default settings i seem to be getting fluctuating framerates…
I’m not sure, but I think MAME’s internal counter might be fluxuating since RetroArch’s dynamic rate control works different than MAME’s throttle. Try enabling the throttle core option and see how it affects the counter. Enabling that will disable fast forward though.
I haven’t noticed anything weird with the throttle off personally. Gameplay seems smooth and consistent on my system. There was a fix a few versions ago that made the framerate smoother; shadows in Neo Geo games now blink at a consistent rate, for example.
It’s smooth here so I don’t know.
So your not getting the fluctuation in speed? ( pressing F11 to bring up the info)
100% flat, not fluctuating.
Hmm, could be yet another G-Sync bug then maybe!??