I like to work at the pace of the team. If the party wants to go fast, I will accommodate. If they need more time, I will give them time. Instanced dungeons are a team effort and the whole party needs to agree on the pace and clear accordingly. As for me, I am flexible, and being flexible in terms of pacing is important when working with different parties during dungeon runs. So for me speed is a non-issue but communication can be.