I'm still on Win 10 1803, but I had a problem with this driver and had to revert back to 425.31. Everything worked well until my G-Sync monitor went to sleep. It would easily wake up again, but then the system would become very unresponsive in that the mouse would move / screens would scroll with big pauses interspersed with short periods of normal activity. Nothing short of a reboot would put things back to operating normally until the next time the monitor went to sleep. There wasn't any CPU or Drive Access activity going on when things bogged down, so I'm guessing it's something related to WDDM 2.6 trying to run on 1803. In any event, going back to 425.31 completely resolved the issue.