If you find performance issues on PPSSPP, consider using a dedicated PS1 emulator which can run standard .iso files more natively:
: You can remap buttons to mimic the classic arcade layout or use a Bluetooth controller for precise combos. Tekken 3 Iso File For Ppsspp
To run Tekken 3 on PPSSPP, you are not running a native PSP ISO. Instead, you are using: If you find performance issues on PPSSPP, consider