[WTA] DD-WRT, how to prioritize bandwidth ?, for Diablo 3

Hi, my router just flashed to DD-WRT firmware.

I wanna prioritize the bandwidth (QoS) for online gaming (Diablo 3), if I add my MAC address like this, when my brother streaming drama, does it still affect the speed of gaming in my laptop ?

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Previously using D-Link original firmware and when I brother streaming drama, my Diablo 3 totally cannot run, its just has a serious lag there..