I’ve also been having fps issues in game recently.
When doing sanctum of domination, my fps drops on most bosses from ~50-60 to ~10-25. A couple of bosses where it does not lag nearly that bad and seems fairly smooth are Eye of the Jailer and Painsmith Raznal.
I had little to no issues in Castle Nathria with the same or better settings.
I have tried:
-Setting everything to lowest settings
-Disabling Addons
-Scanning and repairing game
-Clearing cache
-Making sure drivers are up to date (they are)
-Switching to DX11
-Undoing every overclock I had on my PC (made it slightly worse in the world but no change in raid)
Nothing seems to affect the fps in the raid.
Computer specs:
CPU - Ryzen 7 1700
GPU - NVIDIA GeForce 1080
RAM - 16GB 2133mhz
OS - Windows 10