Well usually it's not like that for me but I did have some near unplayable runs in the past. I've found a workaround to this problem. Simply restart your client right before you enter Maelstrom, and once you log in go right there so the game ends up loading the minimum amount of zones outside the arena. Most of the glitches are in fact caused by the client having too many things loaded and causing lag. Also these days may be some server side lag due to many people accessing the arena at the same time because of the event. I've noticed that even before this runs not done at peak hours were much smoother.