On PC, I've been noticing a lot of big framerate drops everywhere since the DLC.
DX11 is 100% the culprit here. This needs to be fixed asap.
I was wondering why the game performance is very poor approximately two weeks before a new dlc is dropped on XBox with frequent random dashboarding, freezing, slow attacks, etc. Are the developers aware that this has happened every time with Imperial City, Orsinium, and now it seems to be happening with Thieves Guild?