When it comes to lag, Battlefront is one of the best experiences I have in years of multiplayer games. Almost all of time everything runs perfectly smooth, and the three or four times I had lag for a minute, it was actually because of my connection.
No you can blame a lot of things on DICE, but lag? Pretty sure it's your connection and not the game.
Nope there isn't anything wrong with my connection. I even checked my connection speed, rebooted my Router etc just to make sure. Other people have also reported it.
*Edit: It has only started lagging since the update.
**Edit: Seems Kingwingin gets the same problem. I get the stupid warning triangle 90% of the time.