For comparison, it's also taking ~3min @ 50 iterations on my 12c Threadripper using OpenVino. It sounds like the improvements bring the M1 performance roughly in line with a GTX 1080.
I have Macbook Air M1, which is passively cooled. When cooled properly, that is thermal pad mod combined with a fan under the laptop, I'm getting closer to 2min - something like 2.8s per iteration. I guess it would be something 140s for 50 iterations on a MacBook Pro or Mac mini for M1.
