Legality disclaimer: Downloading copyrighted GameCube ISOs is illegal unless you personally dump the disc using a Wii or a compatible DVD drive. This article is for educational purposes and applies to your own backups.
If you own the original discs, here are your sources for pre-compressed formats: gamecube rom highly compressed
Devices like the Anbernic RG556, Retroid Pocket 4 Pro, and even the Steam Deck (64GB model) struggle with raw GameCube ISOs. After the operating system, you might only fit 10–15 uncompressed games. Highly compressed ROMs allow you to carry 50+ titles on a single 128GB microSD card. After the operating system, you might only fit
Contrary to old beliefs, highly compressed RVZs often load faster than raw ISOs on SSDs because the emulator reads less physical data from the drive. However, on slow SD cards (Class 4, U1), decompression can introduce slight delays (0.5–2 seconds) during area transitions. However, on slow SD cards (Class 4, U1),