An .iso loads directly into memory. An RVZ file must be by your CPU. On a gaming PC (Ryzen 5+, i5+), this is negligible (<5% CPU). On a low-end laptop (Celeron, older Atom), a highly compressed RVZ may cause frame stutters and audio pops .
: An older format natively supported by Dolphin. It is useful for basic compression but cannot handle junk data as efficiently as RVZ. gamecube rom highly compressed
Borrowed from the PSP scene, this compresses the ISO in chunks. While usable, it offers worse ratios than RVZ and is rarely used for GameCube today. this is negligible (<
Legacy Dolphin format; mostly replaced by RVZ but still widely used for older collections. Multi-System gamecube rom highly compressed