Odin
I have to third this. I have experienced lag up to 6000ms+ when interacting with objects and have seen teammates teleport and such.
I am guessing the netcode would also be part of the culprit, or the new hardware, although these things were really annoying in the Vale for instance before update, but less so in other dungeons. I guess mutualizing more the instances actually spread the problem.
I hope it helps them get to the root of it, for as for now the high end content is nigh unplayable for me.