Do we have new optimal make settings for OS X Intel, or just make -j3 TARGETOS=macosx still?
The kick in the left nut for OS X SDLMAME users is that you can't compile a 64-bit binary because there is no 64-bit SDL library. The kick in the right nut is that multithreading isn't working and so you can't offload the final blit to the video card like you can on Windows. Well actually it works, it just keeps spitting out 'just leaking' errors in the logs.
Try both of these and see which one is fastest. Should be just a couple FPS though, if any.
make -j3 TARGETOS=macosx ARCHOPTS=-march=nocona
make -j3 TARGETOS=macosx ARCHOPTS="-march=pentium-m -msse3"
I saw a discussion somewhere about using the nocona switch on Core-architecture CPUs, some guy was arguing for it but that's all I remember.