i'm trying the quasi88 emulator
Hi! I don't use this emulator, and my best reference about it is the libretro documentation:
As I don't know much about this emulator, what I can suggest is that you check your BIOS.
Also, what version of Recalbox are you using (say the version, don't say "the latest")?
Did you build your Recalbox yourself, or are you using a ready-made image from the internet as a base?
Can you test on another computer and see if the result is better?