Well, after the last SDLmame release I have done other tests and I found that almost all drivers where 3D stuff is involved have a dramatic boost in speed under Mojave while under High Sierra (and previous OSes) they are sluggish.
This is true, for axample not only for System22 games but also for the Ultra64 based Midway games, now all of them are a very really enjoyable experience so for me the Mojave upgrade has been a big thumbs up!
I don't know exactly where the problem is because both OSX 10.13 and 10.14 were installed on my Macs from scratch so no other apps or settings were slowing down the machines, also the build of SDLmame was done with the exactly same compile options and the SDL library was absolutely the same, and so the Xcode version. This happens also with binary builds from other people like the ones available, for example, from sdlmame.lngn.net so I know for sure is not a problem of my compilers.
Also is not GPU brand related because I have experienced the same thing both with a nVidia GTX680 and a ADM HD7950.
I am quite sure that this performance degradation happened since a certain MAME version on, because I remember very well that Ridge Racer was running smoothly and at a certain point it becomes stuttering both on audio and video refresh.
I also regularly checked the forum to see if other users were experiencing the same issue but no one come out to talk about this so always thought it was a driver issue to be fixed in the future.
Well, it seems in the end it has been fixed by Apple :-) Of course the Windows version of SDLmame never suffered this problem, but the very strange thing is that on OSX it made no difference for metal/opengl/soft video acceleration setting, it was like somewhere there was an handbrake on the speed of those 3D games.
Last edited by MacBox360; 11/02/18 10:06 AM.