Supported by PCSX2. The emulator creates an index file when first loading a .gz file, which prevents performance loss during gameplay.
When working with PS2 highly compressed games ISO, there are a few things to consider: ps2 highly compressed games iso
What's your and how much space are you trying to save? Supported by PCSX2
For modern emulation, .CHD (Compressed Hunks of Data) is the gold standard. It compresses about as well as .7z but allows direct booting in PCSX2. ps2 highly compressed games iso