PSA: The version of MAME used by RetroPi is literally 15 years old at this point and lacks all of the massive accuracy improvements that have been made since. You can literally get a computer from an e-waste recycling center that will run modern MAME better than a Raspberry Pi.
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It's better to cross-compile on a more powerful machine. As for running reasonably well, the answer is "it depends". A modern Pi 3 can handle up to and including the Neo-Geo or so, but e.g. Donkey Kong will keel over due to the component-level analog simulation for sound effects.
The problem simply is that MAME has to contend with architecture issues that other emulators don't. It emulates hundreds of CPUs, from bit-addressable to qword-addressable, and must provide a generic memory API for all of them. Being generic costs cycles that the Pi doesn't have.
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It's not that the Raspberry Pi is *bad* or anything, it's actually a very cool little system. But at the end of the day, while the Ford Model T was a very cool car, you wouldn't take it to the track and race it against a Tesla.
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Very true. And to further the analogy, you could drive the Model T on terrain that you’d never want to take a Tesla. The Pi’s form factor and its ”just fast enough” specs make it ideal for small projects. Perhaps one answer is a community driven, Pi-optimized MAME branch.
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