that sounds like older issues, DXC was fully playable by 9.9.7 and the side games work perfect by 9.9.8, as for MMX, you gotta tap F5 a few times to get it working properly.
This of course is coming from the Windows version of the emulator.
I've tried my best and it still sucks, the emulator is even a PPSSPP 1.0 version. Maybe the emulator captured my mind and keep shitting at me, for my lazy and weird purpose. I'll return to next-gen PlayStation console area then.