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This will be resolved with 7.2.1 coming soon
It is so low as n64 is really CPU demanding.
You can adjust it, search for n64.videomode in the recalbox.conf
Look here for more info: https://github.com/recalbox/recalbox-os/wiki/N64-:-return-to-ES-(EN)
@einklinker not yet, but we're working on it. A new GPi firmware must first be released, then we have to write code to handle it.