Those numbers are really impressive; goes to shows how effective the Apple silicon design is.
Be interest to see how MAME scaled across the different M4 CPU models, since MAME typically doesn't scale much beyond 3 or 4 cores, even the core count of the base model M4 shouldn't affect performance that much, so it should be possible to see the effects of the memory bandwidth differences between the three models of CPU: M4 having 120GB/s M4 Pro having 273GB/s M4 Max having 546GB/s
It would also be interest to see how the AMD Ryzen AI Max+ 395 in Framework Desktop compares, since it has a very similar package and memory layout to the Apple silicon, with its 256 GB/s on package memory, which puts it head-to-head with the M4 Pro at least memory bandwidth wise.