Most of the time I solo Que for Dungeons for my Zodiac quest, and I do speed run for the most part, but before I go off and pull 6 groups of Mobs, I look to see the level of HP every1 has, and I also ask if a speed run would be ok. If i get a bunch of no's. I run the dunegon at a normal pace.

Its not really so hard to ask, and be courteous, even if others are being rude.