I've been doing ST for a while that way, but not that fast LoL.

I'm using a frost mage not that well geared and it takes me 3-4 pulls in that same area with some down time for health/mana refills.
.. I also go ahead and clear the lower portion with usually 2-3 pulls, it's quick and easy

at Lvl52, I think I need to go elsewhere for a lil faster Xp