For Need for Speed games, stick to compression level 5 or 6 . These games stream data from the disc constantly (due to fast-paced driving). Too much compression causes "world pop-in" or audio glitches during high-speed chases.

Look for files ending in .7z or .rar . These can often shrink a 4GB ISO down to under 1GB because PS2 discs often contained "dummy data" (empty space) that compresses extremely well.

Download the Compressed File: Look for reputable ROM sites that offer .7z or .zip versions.

, highly compressed versions can sometimes be found as small as (demo versions) or specialized repacks. www.quora.com Performance and Compatibility Loading Times