If you want to reduce file size while maintaining playability, use these formats instead of raw ISOs:

The result? A , .rar , or .ciso file that requires extraction or conversion before play.

The search for a is a practical one—driven by bandwidth caps, SSD space, and the desire to keep a vast ROM library tidy. While pre-compressed downloads exist across the web, the safest, most reliable method is to rip your own disc and apply 7-Zip’s Ultra compression.

: It features a different boost mechanic using "pips" for short bursts rather than a continuous meter.

: The gold standard for playing on an actual Wii via USB loaders. It "scrubs" the empty space, significantly reducing size without losing game quality.

Is there any reason to use ISO over WBFS? : r/DolphinEmulator