@lazaruz A pi4 is faster to handle the more accurate emulators but it also makes some new games playable. Taito F3 games are now full speed. You can play sega system16/18 games on fbneo without slowdown so I don't need to deal with mame2003's buggy bootlegs. You can use mame2010 or 2016 for bug-free system32 games like golden axe 2 and spiderman. 3d games like tekken, etc are still unplayable. If you can run your favorite games in fbneo now then there's no point using a pi4.
Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first