Performance was adequately for this initial time on 32 bit CE21ng and 64 bit CE22no. I see that was included a release 1.29 to last retroarch for CE. Now last bettle saturn in ver. 1.32.1 is from march 2024 and have many improvements also for video framebuffer and fixes for case studies with disabled opengl, but maybe is not cleared ordering in numbering of versions. https://mednafen.github.io/documentation/ChangeLog.txt But i see that for kodi are available some lower numbers of realeasing: Tags · kodi-game/game.libretro.beetle-saturn · GitHub
Conclusion: not developed yabuse (from 2016) in CE have better video and game speed, but more cpu in yabuse is used and whole box is freezed after some minutes of gaming due to heating. Bettle saturn is slower and more stabile, but need many improvements from newer released version 1.32.1 or arm optimalization for amlogic cpu and mali gpu from Mednafen Team .