Pro tip: Tell me you're new to a dungeon /rant

[NyarukoW]

... let alone any additional quotes about this sentiment earlier in this thread. You will INTENTIONALLY wipe your group to stop a speed run.
....

I can stop a speed run without wiping the party, here are some simple instructions;

As DPS you can withhold DPS and the speed run will come to screeching halt, it is not going to be much of speed run when there is only 1/2 the DPS or less
As tank you can just simply pull less. The idiot that pull mobs on their own, they touched it they bought it and they can die to it, I am not going to get aggro back from them, no thank you.
As a healer, this is the most challenging when you have a speed running tank. You have to time it just right as to when to cleric stance holy spam so the party is healed but the tank dies with mob. But with practice you can get this 99.9% of the time. Usually it goes something along the lines of E4E, regen, medica 2 and holy spam. Let the tank die while everyone else DPS down the mobs and everything is fine and dandy while you get to recharge mp.

I don't need to wipe the party to stop the speed run, I just need to let the silent speed runner kill themselves and offer their own corpse as sacrifice. Their death will buy the necessary wake up call to slow down and pay attention to how the group operates and communicate. If the their method of communication is verbal harassment, I will report them to the GMs and hopefully they get a penalty and learn not to pull everything without discussion.

All it takes to avoid all this is nicely asking, "can we try a speed run?" at the start and wait for everyone to say yes and then go. If the speed runner is too rude and impatient to do that, they will learn what they get from me the hard way. What you don't ask is "I am going to speed run if no one objects" because if there is any communication failure it will be too late. Not to mention that is really bullying the rest of the group and really obnoxious and irresponsible and placing the responsibility on other players to be able to see, understand, and respond in time.