remember that Battlefront uses the same broken Frostbite 3 engine which, to me, tells me the game was coded for a limited tick rate that will never reach that of CounterStrike: Source. It's been said that as you increase the # of players, the higher tickrate cannot be sustained. I feel it's an issue with the resource usage, over the years BF4 has existed, gamers from Intel at one point, then later AMD at another, have commented about memory leaks. One is fixed, another is broken....that's how I feel about it so when people say BF4 is optimized (some do claim that, although not many) I say it's hard to optimize a game that is still in a beta test known as the "Community Test Environment".
that is one reason, for me, after seeing the similar glitches in BF4 and Hardline, I lost hope for Frostbite 3 and any game that uses it. you don't put a broken engine in another model of a car and expect problems with the engine to be fixed all of a sudden...unless you have DICE-for-brains or you have EA business practices like quantity > quality.