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this game has a really weird way of making sure you don't lag by having way too many enemies invisible, i mean.. kiting i ran into a zerg, that i had no clue existed, not ok!
also, enemies seem to pass a threshold sometimes while running away from you where they poof, i'm assuming its a part of the same issue when there are too many other enemies in the area
i had more enemies on my screen in daoc than gw2, there is no excuse to not be able to handle it these days.