I have almost 70 hours in game, up until Grymforge I had an acceptable performance with low-mid graphical settings. The game still stuttered sometimes in packed up areas such as the Manor where the Flaming Fists are, but nothing deemed the experience unplayable or otherwise problematic.
In my almost 70 hours of gameplay I never experienced malfunctions from my system and everything worked just fine.
I run DX11 mode, as Vulkan feels way more unstable for my system with way more stuttering and actual crashes happening.
My problem goes like this... When I first entered Grymforge the performance was as it were throughout my playthrough, some stuttering here and there, but again, nothing that deemed the experience problematic.
As I'm fighting Nere for the first time, it ends in a TPK so I naturally load my latest save just before blowing the pile of rocks and freeing him. The game started loading way slower than before and when it finally loaded, performance started getting really unstable with even worse and prolonged stuttering that lead to the game crashing.
I restart the game, load my save file, and for some reason the loading goes wayyyy slower than the previous one. The game finally loads after like 5 minutes and Grymforge graphics seem vanished as the system tries to render the map. Needless to say that the graphics NEVER fully load, characters, npcs and terrain seem to be missing and the game runs only in an endless stutter. It has become impossible for me to play as the game keeps the slower than usual loading, graphics never fully render in the Grymforge area and even if Im lucky and patient enough to wait half an hour or so, so that some, if any of my party members appear on the screen, the game is just unplayable as of the constant stuttering.
I've fully updated all my system's drivers, lowered graphics and tried to run it with Vulkan but to no avail.