I personally like speedruns as a healer, it keeps me awake and it's one of the last things that gets me excited in a scripted dungeon I've already run like 1000 times and chances are I'm there just to get it done.

But not in a million years I would feel entitled to force anyone in the group to speedrun just because I like that for said reasons. You have to respect that other people might not be on the same page as you are. This is not a singleplayer game, the ultimate feel of accomplishment should come from team play experience. If you are pulling mobs (not even trying to communicate in chat) to show the tank and the rest of the group that YOU want to go faster, please, uninstall the game and go play Duke Nukem 3D.