When using two displays with different refresh rates on Windows 10 (in this case 144hz and 60hz / 120hz and 60hz), having Netflix or Twitch streams in a browser window on the 60hz display while hardware accelerated video decoding is enabled in Brave , will lead to stutter and frame drops.
If I remember correctly, this has been an issue with Chrome and Firefox in the past, and has since been fixed with those browsers.
Posting this for awareness any possibly further testing.