Very slow load time

[LunaMoo]

Did you used install data? If during installation you mess around ie. use savestates, maybe even change some options it might be corrupted and then load garbage. In which case you should manually remove that corrupted install data.

Installing data takes a bit of time which is what you might had experience, but you don't need to install it to begin with since PPSSPP is much faster than running the game from UMD, and there are definitely cheats to unlock things unlocked by installing data without doing it.