From what I’ve seen, MHS is one of the most taxing 3DS games to emulate. It could be Citra or the game itself, but I’ve anecdotally seen people compare its performance to Xenoblade Chronicles or Luigi’s Mansion in terms of emulation benchmarks. The last time I tried MHS on Citra Canary even w/ my gaming PC , the experience was so bad that I ended up just playing on actual hardware.
I would suggest trying:
- Citra MMJ
- or the android port of the game (it’s not free or emulation but it’s a good port)