A true "highly compressed" file prioritizes space savings. For "extra quality," you want the untouched original ISO (or a minimally compressed one). However, because PS2 emulators decompress CSOs on the fly, a compressed version runs identically to the full ISO. It will look the same, but you will save hard drive space.
: Players can team up locally to control Liu Kang and Kung Lao, combining unique combos and team-oriented Fatalities. A true "highly compressed" file prioritizes space savings
Play through the events of Mortal Kombat II from the perspectives of Liu Kang and Kung Lao. It will look the same, but you will save hard drive space
Compare the hash value of your extracted ISO file against official databases like Redump to confirm that your file is an exact, uncorrupted copy of the original game disc. Compare the hash value of your extracted ISO
Set this to 2x Native (720p) , 3x Native (1080p) , or higher depending on your graphics card.