Hello, I use the following trick for Through closed doors ...
The doors are charged more slowly than other graphics in WOW and knowing that we will use the latency in our favor.
Stay away from the door and begins to generate latency, I use you tube, as 10 videos at the same time, but much will depend on the speed of your connection to the Internet.
Run to the door ... if everything goes well you pass before the door is loaded.