Yes. The modded code is inefficient. The 300MB file ironically runs worse than full PSP ISOs.
Getting to run on the PPSSPP emulator is a popular workaround for fans who want the modern MK experience on mobile devices without the full storage requirements of console versions. While the official game is much larger, highly compressed "mods" (often based on Mortal Kombat: Unchained ) allow you to play with MK11 textures and updated rosters in a file size of approximately 300MB to 500MB . Key Features of the MK11 PPSSPP Mod
"Mortal Kombat 11 (Demake) [PSP] [300MB] [HQ] CDRomance
: At least 2GB of free space for extraction and save data. System : Android 6.0 or higher is recommended for stability.