"highly compressed" in the world of RPCS3 (the PS3 emulator) can mean two very different things depending on who you ask.
Pro tip: Use a tool like CompactGUI (Windows) or compsize (Linux) on extracted JB folders. These use Windows Compact OS (XPRESS4K) compression, which is seek-friendly and can save 20–30% space with minimal performance loss. This is not "high compression" (like 7z), but it works with RPCS3 reasonably well. rpcs3 highly compressed games work
| Game | Raw Size | 7z Compressed Size | Ratio | Extract Time | Playable? | |------|----------|--------------------|-------|--------------|------------| | Persona 5 (US) | 20.3 GB | 13.1 GB | 35% | 2m 11s | ✅ Perfect | | Demon’s Souls | 8.7 GB | 5.9 GB | 32% | 1m 04s | ✅ Perfect | | The Last of Us | 33.8 GB | 24.2 GB | 28% | 3m 45s | ✅ Playable (needs patches) | | God of War III | 34.2 GB | 27.5 GB | 19% | 3m 22s | ✅ Perfect | | Red Dead Redemption | 18.1 GB | 13.4 GB | 26% | 2m 30s | ✅ Playable | | Gran Turismo 5 (repack) | 31 GB (raw) | 9.4 GB | 70% | 1m 50s | ⚠️ Missing menu music | "highly compressed" in the world of RPCS3 (the
Lossy Deletion: Some repacks achieve extreme sizes by stripping out all audio, low-resolution textures, or all cutscenes, which often breaks the emulated experience or prevents the game from booting. This is not "high compression" (like 7z), but
How Does it Work?
