I've been running it on a 4K screen for a bit, since I've been using the beta channel, and it's seems to work very smoothly. At least, I have noticed the lag or

I've been running it on a 4K screen for a bit, since I've been using the beta channel, and it's seems to work very smoothly. At least, I have noticed the lag or choppiness you've mentioned. One caveat is that my screen runs at 60 hz, so if you have a higher frame rate, then you might see things I won't catch.