I've done back to back benchmarks on Arcade MAME vs official MAME versions in the past, there is no noticeable difference in performance, any variances are generally within the margin of error between runs.
This was just a case of me having my MAME collection with me at work and having a fast PC to play with. The customer has already picked up the PC, but if I get chance with a similar system I'll do a run with Official MAME release, I'll also keep a eye out for a Ryzen 9 3950x build to try.
If all else fails, Burn the manual.
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