Im gonna post here since im not getting any damn answer after days posting in support.
Looks like when the server gets +6k population , insane lags come to players. I don't know about you, but me and some people are getting incredible lags when log into the world.
This is really unplayable, i truly know is not about my conection, because i have two opened wow clients, one with Nostalrius, and another with random server (Doesnt really matter which one).
The funnier thing is that Nostalrius shows 70ms pin, but i have such a mad delay.
In any case, im telling you, if you cannot handle that amount of population, make a filter and queues on the server.
Meavy some people don't get lags (a part of them liar fanboys). But there are people who cannot play decently because of this problem.
Cheers.