@Benzitor You need to go to Recalbox's internal BIOS manager, check that all your BIOS is being properly recognized (green thumb). If they are not, you have a bad BIOS, and you need the right BIOS. BIOS is copyrighted and cannot be shared, it is against the forum rules to request or share any type of copyrighted content.

Remembering that: not finding the BIOS that is requested by the emulator, does not indicate any bug in Recalbox, it just indicates that you have not yet found the right BIOS.

About slowness in FBNeo, it is usually related to a bad ROMSET (maybe this link will help you: https://forum.recalbox.com/topic/22052/installing-older-final-burn-on-new-recalbox-version?_=1605830671452)

I don't see reports of other users having problems with the GPI, so it doesn't look like a bug, it looks like a BIOS or ROMSET problem (as already mentioned), or even a bad configuration.