I always ask the tank to make big pulls at the start of the dg, if he does not then I just alt+tab during and in bettewen pulls at times, he does not need the mobs to die fast if he is just gonna pull 2/3 of them at a time, actually the tank guy and the healer could solo it without major issues, my full dps is only needed if bigger pulls are made, where the tank is gonna run out of cds or the healer is gonna run out of mana if the mobs don't die fast enough.