As a Windows Insider I had some issues with YouTube for months, I posted about the fix somewhere else before, but here: Use nVidia Profile Inspector, wait for it to load, scroll down to section 5 (common), and find CUDA - Force P2 State and turn it OFF. I do this after every time I update the videocard drivers now. Noticed after turning off this power-saving option that's enabled by default and can not be changed from nVidia Control Panel, that it fixed all my YouTube unresponsiveness issues. For those of you with unresponsiveness issues, let me know if it helps. My biggest problem was after watching one or two 4K videos, comments and everything on YouTube started feeling sluggish & unresponsive, had to exit the browser and open it again to fix YouTube sluggishness (both with Chrome & Edge). Now I can use YouTube for extended periods without such issues happening.