I've tested and its working very good, my specs:
Switch on 7.0.1
Atmosphere 0.8.7
Using "title redirection", to load RetroArch, so i load PPSSPP Core, and play game in *.ISO format.
Aditional Notes:
clock at 1224 MHZ
Using Cheats.
After Load Game, opened quick --- Options --- CPU Core ---...