For a developer you sure don't realize how small text files are, being a developer myself. I am a developer (not for games, but the principle is the same), and me and my team add extra code in the program that will be something like: Originally posted by Roclemir:The extra 5GB is because it's the developer's test realm. There could be other reasons too of course, such as future files included, but I imagine the bulk of the extra download is made up of reporting type code. When the full game is deployed, test = false, therefore only the game lines of code are compiled, so that could be thousands of lines of code less, because they no longer care about every tiny little bit (they still care a little, just not as much as testing) so the game files deployed are much smaller. The tracking lines are ONLY compiled and placed in game files if test = true. These kind of if-else statements will be littered throughout the full source code so that they can track exactly what you do during testing. The extra 5GB is because it's the developer's test realm.