Some figures:
Regarding the large trash pull leading to The Old one I peak at
~12k DPS over 30 seconds if you chop out the pull. Include the pull and mopping up the stragglers, it's around
7-8k over a minute. Want an easier pull to DPS in? The large Salt Swallow+larvae again in Skalla, I can consistently sustain over
16k dps for that pull which with most roulettes is around 20 to 30 seconds for me. Across the entire dungeon? I'm usually pulling around 3.3k in Skalla, I've never really found a groove to hit the nigh 4k mark that I could in Temple.
WHM DPS can be incredible (and on a side note, War DPS even more so if the group can mow large pulls down fast enough).