I bought a Macbook Pro M1 MAX with 32 GB RAM recently! The box says it has 10 cores (if I'm correct). I read this post and I'm happy to share some tests but ... I'm a complete beginner and I just use the M1 build of mame and some frontends (all graphical). I never touched any Terminal...
If you explain me step by step what to do on my Mac, I can try (no guarantee I can do this! :-D)