@mankysteve I'm not sure where you read that but as an experiment I tried "Star Wars - Rogue Squadron (USA) (Rev A).n64" It runs with a lot of audio glitches and slowdown. I would not call it playable. I am using a Pi3 at stock settings and mupen64plus tested with all of the various plugins.
If you are determined to play it just mess around with the resolution and plug-ins using runcommand menu and see what feels best to you.