I am having major stutter/lag performance issues myself. Now I have fixed it enough that the lag/stuttering now only happens in certain areas versus every setting. Specially Arlathan and Dock Town is horrendous but I haven’t played in Dock Town because after following Neve for 2 minutes and seeing the stutters it’s just not payable in my opinion.
I also have never experienced problems with any games before either.
That said, I’m going to try your computer “restart” option and see if that works. For the shader cache, is there a way for us to clear that?
Thanks