PPSSPP standalone has great compatibility and is a bit better perfomance wise than RA core. I have over 20 games and most of them are fullspeed. Even gta vcs is at stable 30 (with GLES2 ver) with minor stutters when loading chunks of zones, but its totally playable. I've recently completed Dante's inferno, its fullspeed (had only 1 major bug where it always crashed at a certain spot so i had to progress to the next checkpoint on pc and then continue on switch after that again). Daxter, Def Jam FfNY, SSX on Tour, MGS PW, Tekken 6, Prince of Persia Revelations, those are just my examples - all of them are fullspeed and playable (maybe with some minor bugs). Overall switch handles psp very well.
Edit: there are also 60 fps cheats and other patches you can try if you care. For example you can bind right stick to camera movement with a cheat in GTA VCS.