Emulating N64 and Dreamcast on my Raspberry Pi was always a roulette of chaos. It could either end with a rather decent emulation of the game or CHUGFEST 2019 EDITION!
For Dreamcast at least I could play Project Justice rather well (as long as I didn't select the construction site, that place was glitched up the ass), and Tech Romancer worked fine too (some minor graphical glitches, but nothing that horrible), but none of the N64 titles worked that well, they always had some problems with the graphics ç.ç
Also, not a console, but rather two games: F-Zero GX and Bloody Roar: Primal Fury.
In my previous PC (which wasn't that good), F-Zero GX usually ran well, but if I tried to run at 720p and up, it had some really annoying stuttering. In my current PC, it works well enough at least, even if I believe the game is sometimes having a micro stutter during the menus, but gameplay is smooth.
But Bloody Roar for some reason ALWAYS has some moments where the framerate drops to single digits before going back to normal, and I tried multiple ISOs from this game and they all show the same results ç.ç