My suggestion is basically to make mobs stackable like on Factions, it reduces the server lag tremendously. You'd still have to kill the mobs one by one, not even if you splashed it with potions.
OMG thank you for making this but cba. SUPPORt I crash sometimes in my base because there is too many bloody blazes.
Lags sake, support. While it is fairly easier for mobs to stack, i'd rather have less lag than unstackable mobs.