I also have huge lag spikes since last patch, while doing normal dungeons, savage content, or byakkuo extreme. Sometimes the server even kicks me out while I am levelling a character, it´s almost unbearable because we are paying a subscription for a game with huge lag spikes, when I have 0 problems with lag in other games. I have tried everything to see if the problem was mine but I think it´s pretty evident that it´s a server issue. Please fix this ASAP, or you will lose a big number of players in the Chaos data center.