xTr1m: I think the vst in question is 64klang2?? I’m just wondering does the gui in that use any DirectX/OpenGL calls? Anyway, I assume you’ve already thought of this but if you haven’t I’m curious, is there an option with the NVidia driver preferences program to disable ‘wait for vertical sync’ (similar to this post -> https://forum.renoise.com/t/gpu-drawing-vst-plugin-question/44778 )? Not that I think that will help the stuttering/laggy gui xTr1m in this case but I was a little curious if there is any slight difference.