There's an option in developer options (scroll to the bottom and select others) that not everyone will find as some people just plug and play
HDMI 2.0 delivers 50 to 60 fps compared to the default setting of HDMI 1.4 which is around 24 fps
My picture quality improved quite a bit choosing HDMI 2.0, especially with UHD on YouTube
I hope this helps a few other people
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