I found this fix and it’s fixed the issue for me. One of my guildies who lives in another state and uses a different ISP will experience the same latency issues when it happens to me when we’re in dungeons or doing arenas or bgs together etc. I gave him the instructions shown in the post below and resolved it for him as well. You can still get a little bit higher MS at times and even if it increases to 100 -150ms the game still feels 100% playable and not feel like it’s 2000ms. I felt like my overall world ms was what it should be (around 35ms) more consistently and hopefully this fix can help you as well.