A standard PS2 game disc holds roughly 4.7 GB of data (DVD-5) or 8.5 GB (DVD-9). A "highly compressed" ROM is a standard game file that has been shrunk using advanced compression algorithms to reduce its file size significantly.

You can find highly compressed PS2 ROMs on various websites and forums, such as:

The choice of emulator determines which compressed formats you can run.

Interestingly, compressed formats like often load faster on Android than raw ISOs because the CPU decompresses them on the fly, leading to less raw data being read from the storage chip.

: A lighter open-world title that performs well even on lower-end chipsets. Download highly compressed ps2 games for emulator