To get the best balance of speed and visual quality:
Unlike native PSP games (which go into the ISO folder), PlayStation 1 emulation files must go into a specific subfolder. Open the PSP drive on your computer. Navigate to the folder. Open the GAME folder. resident evil 3 psp iso highly compressed
A compressed alternative format natively read by the PSP and PPSSPP. A highly compressed Resident Evil 3 file is often converted into a .cso format or compressed into a .rar or .7z archive for smaller download sizes (sometimes reduced to under 200MB). To get the best balance of speed and