I have no idea, but all of the sudden the game runs like crap on my system. Sometimes i have well over 100 fps and other times i struggle to even get 30.
I have tried reinstalling windows, and different Nvidia drivers and some other tweaks to the game - nothing worked, not even reinstalling wrath.
My system is
Windows 10
GTX 970
8GB DDR3
i5 - 4400 3.2 ghz
runs on 120gb SSD
Game is really poorly optimized and that's 70% to blame. Other 30% might be addons, current players online/in that area or just the alignment of the stars, you never know with 3.3.5.
Try killing any background tasks and check addons memory usage, some get quite greedy.