DICE says that because of the sheer size and scope of Battlefield 4, you can never have a "perfect" netcode -- there are too many things that can go wrong.
via N4G: pc news feed http://n4g.com/news/1349100/dice-you-can-never-have-perfect-netcode-in-battlefield-4
via N4G: pc news feed http://n4g.com/news/1349100/dice-you-can-never-have-perfect-netcode-in-battlefield-4