Im not sure and maybe one of the other helpers will step in to give you a better answer. I do know that for some reason Bridgeport runs my cashe package files really high. This usually happens the first time you start a town and then the files go down once you save that new town and clear your cashe package files. With bridgeport my package files are always hgh so I dont play it. This is the only world where my package files get huge.
You can try deleting your cashe files http://simswiki.info/wiki.php?title=Game_Help:Sims_3_Delete_Cache_Files
Delete the 5 cashe package files as stated in above link. See if that clears some issues for you. I clean them out every time I start the sims, new files will generate every time you play . It cleans you game without deleting anything in your game.
