yeah I wanted to try it see if it worked better in 2.5, since i hear stuff is supposed to work better on O3DS in 2.5
mGBA didn't really work well and i had read before that gpSP was faster. But unfortunately gpSP just hangs on loading a rom :/
Probably wouldn't be very fast on O3DS so it would be pointless in the end, but i wanted to try just in case it did work well
There is a thread for RetroArch, I'd advise posting there rather than making a brand new thread.
https://gbatemp.net/threads/retroarch-nightly-builds-here.396843/