If your hardware is the reason you are looking for "highly compressed" versions, consider these safe alternatives: GTA V Graphics Settings and Mods to Boost Your FPS

You have two safe choices:

: There is no official "GTA 5" for the PSP (PPSSPP emulator). Files claiming to be GTA 5 for PPSSPP are usually modified versions of older games like GTA: Vice City or GTA: Liberty City Stories .