I'm currently boosting my three locks with a ret Pally through Scholo.

I park them on the stairs just inside the instance. drop off the wooden bridge to the room below. clear the room, not stopping for any reanimated corpses.

I then make my way to Rattlegore, the reanimated corpses aggro most of the rooms mobs to me while fighiting Rattlegore, so once I'm done with him, I'm ready to AOE them down.

then its just a case of clearing all the bosses and pulling the basement full of zombies, and mopping up any stragglers / rooms of mobs on the way back to reset the instance.

Average time 12-15min (can be up to 20 minutes if you stop to loot the big corpse piles.

It helps to have an Enchanter in the group to dis any blues & greens - currently have 246x Large Brilliant shards (and have sold more runecloth than i care to think about)

My Boosting Ret Pally is in a mixture of low lvl epics and blues (3.5k ish GS)