Quote from Mentosftw;1095158:
Anything that moves your character without actually having the player point and click a location to move to has a much higher chance to cause displacement. Especially annoying to fighters who have two stage ones that do that along with tumble, puppets have act one to a lesser degree, and charge for warriors. Heat buster pushes the player back but I'm not sure if it causes displacement.
Displacement lag is more noticeable for us because distance from the server can play a role in how bad it is .
KR who almost has no distance lag has fewer complaints about it, though they still get it through rafting, fishing, and of course weird distance glitches like pummel's out of area animation.
However, one of the most recent patches they got practically has a 50~60% chance of d/c them when summoning more than 6-7 times in a channel.
Which may be why it's on the list so high, because they want an immediate fix for this.
Can you imagine how much more annoying it is that after you summon the 8th time for a pet, you have a chance to disconnecting.
Especially for people who use AOE pets often.
Speaking of which, they're also undergoing a lot of server fixes that may indirectly help NA later on with their own server problems (which may be the reason why NA is server switching).