: Highly compressed CSO files (Level 9) may cause in-game stuttering or longer load times on original PSP hardware, though modern emulators like PPSSPP usually handle them smoothly. Risks of "Highly Compressed" Links
However, not all data compresses equally. Video files ( .PMF ) and audio files ( .AT3 ) within the game already use compression algorithms, so they "compress much less" than other data types. This is why the final size of a .CSO varies from game to game. A music-heavy game like DJ Max Portable 2 might only compress from 1.60GB to 1.40+GB, while other games can be compressed to under half their original size. crisis core final fantasy vii psp highly compressed link
If you tell me which console you're playing on (PSP vs. modern console), I can compare the graphics and gameplay differences! : Highly compressed CSO files (Level 9) may