Respawn decided it was better to uncompress the audio so people running computers from 2007 could run the game, at the cost of eating up about a quarter of the hard drive space that 2007 computer would have. It might have been nice to give us the option to have compressed audio for those of us with modern CPUs and a desire to not use up all of our hard drive space, but Respawn was too lazy to do that. They were also too lazy to let us select the audio language we want to install, and they include all of them, so a large chunk of that space is for all the French, German, and Spanish soundtracks you won't be using.