Hey, i play on a computer with good specs (at still i think it is) but i still have bad fps, especially in battlegrounds (even small ones like wg)

I have

Some I7 processor
8go ram
Geforce Gtx 860M

Im always doing 60 fps > 40 > 60 > 40 > 30 > 50 > 60 > 30, and its not smooth at all... Are my spec not good enough to play lich king? im not even on ultra settings.

thanks you