How do you deal with sluggish tanks?

[Leonus]

Most of the time, a tank Survivability is on the healers and dps. What is there to be uncomfortable about (except for possible aggro isdues). It is arrogance on the tank's behalf to have an idea of what your healer and dps are capable if and not accommodate because if "I am tank, I set rules/pace/whatever" mentality. No sane dps/healer requires tanks to pull something completely unmanageable, but this "I am tank, I am king" mentality has to go.

Btw. if according to you slow tanks/healers are arrogant, what are our average dps players then?

Just as arrogant, but more misinformed. Define the numbers for an average dps.

Generally, better players than the tank can make up what that tank lacks, dps can tank their own mobs, or switch accordingly and healers can keep people alive.

I know if I pull off of a tank in a dungeon, I don't complain, I just kill it. Something that's dead does zero damage.