In WvW it becomes very hard to battle against large groups of enemies because they don’t show up until they stumble on top of you. I hear that the game may limit the number of characters displayed on the screen at once. For such populated areas such as WvW this sounds like a bad idea. I have tried various graphics settings to try and remedy the problem with no solution as of yet.
I’ve seen exactly the same problem. I’ve also seen it in PvE. I made a post earlier in this forum about it: https://forum-en.gw2archive.eu/forum/support/bugs/BUG-Mobs-and-players-suddenly-appearing-pop-in/first#post4322
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