Yup, the high frame / performance mode is fantastic. I tried the "quality" mode running at 4K/40fps, but I appreciate the faster frame rate much more and don't notice much of a difference in graphical quality between the two modes.
I have tried all the modes and tbh they all look the same visually to me. Going to stick to the High Performanc/High Framerate mode with VRR as it runs stunning.