Oh boy, audio stuttering. This is the main problem I’m having with the A04.
Audio stuttering varies a lot depending on which core I am using. The most demanding core I’ve been trying to get working is snes. There are several snes cores. I had the best luck with the snes9x variants, such as snes9x2010. The bsnes ones are all unusable.
I built the cores using libretro-super as originally suggested here.
Also, I only get smooth performance in windowed mode for snes. I haven’t tried less demanding emulations like gba yet. Those might work better.
I tried enabling GLES for compilation, as suggested here, but I didn’t see any difference.
The next thing I might try is installing RetroArch using snapd.