I have intermittent experience with this. Alderaan in particular makes me lag horribly and I'll see 2-4 second delay on skill activation. The other two do it sometimes but not every time. Not sure why it happens.
Obviously PvE is playable, zero delay on skill activation, never have any issues etc. Strange that it exists only within warzones, wish they could figure it out because as a melee class that sort of latency makes the game entirely unplayable, seeing as you have a very small window in which to attack