For highly compressed fixed ROMs , is the smoothest experience on both PC and Android.

The current "fixed" standard for PSX compression involves using formats that emulators can read directly without manual extraction: CHD (Compressed Hunks of Data) : This is widely considered the best all-around format

Extreme compression often damaged the internal file structure. A "Fixed" ROM usually refers to a version where the ECC (Error Correction Code) and EDC (Error Detection Code) have been recalculated so the game passes the BIOS check of an emulator or a modded console. The Modern Standard: PBP and CHD