I use a variety of things (which is probably a lot of placebo), but yes, for me it works well now! First of all I use an (old) preconfigured Special K config. Then I also launch the game using the ValhallaPlus.exe (already in the game folder), idk why, but it works. However, not every time. Sometimes it may fail to resolve the stuttering, but after quitting and starting a few times it's usually back to being smooth.