Sometimes, crucial files are accidentally deleted during the compression process. This can cause the game to freeze, crash, or refuse to load certain levels.

In the early days of internet game distribution, "highly compressed" often meant a game was stripped of its core elements. Files were uploaded in heavily packed RAR or 7z archives where background music, voice acting, and pre-rendered cutscenes were completely deleted to shrink a 30GB game down to 5GB.

Your computer or console has to do a lot of heavy lifting to unpack highly compressed files. A game that took 10 minutes to download might take two hours to unpack and install.

Click . Once processing finishes, transfer the resulting .iso file to the PS3ISO folder on your PS3’s internal hard drive via FTP or an NTFS-formatted USB drive. Warning: The Risks of "Super Compressed" Web Downloads

The Ultimate Guide to Highly Compressed PS3 Games: Do They Actually Run Better?