Thank you so much! Indeed, I had changed the option unthrottle_mute in my ui.ini file, for whatever reason. I just did not find it. This now provides absolutely perfect scrolling, many thanks!
EDIT: This is really interesting. By combining waitvsync with nothrottle, I am completely getting rid of the motion judder described for MacOS in the MAME documentation. The only additional tweak required by some games is a reduction of the speed to 0.99 (e.g. Xevious) to get rid of audio crackling. Finally, after so many attempts, flawless scrolling in MacOS!
Last edited by estefan3112; 04/02/22 04:10 PM.