I have pushed the version to the repo now. It use latest gl4es (so it's has been updated since the "beta"), and use batch mode. It seems quite fast to me, as I could play it while compiling on the same Pandora.
Use batch mode of gl4es
[doublepost=1480849663,1480846182][/doublepost]And to go with the official release, I have built a new experimental release.
I added the fluidsynth changes suggested by @emu3211 and I forced the use of mipmap in textures to try mitigate the texel bandwidth issue @Magic Sam seems to have on his Rebirth model.