League screen buffers when playing youtube

Literally the above, my screen buffers when I have youtube open in the background (actually more like rubberbanding but it's quite difficult to describe). It's not just youtube though, it's videos, streams. This didn't happen before, maybe around February. Anyone know of a solution? P.S Spotify works but I like watching videos while I play.
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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