Here is a solution if your Twitch player is lagging.
Tards.NET · Taking over the world one kappa at a time
Just download that software and you will understand how to use it. It will reduce CPU usage and it wont lag like you would watch on browser? (I can barely watch high on Twitch) but on the software I can easily watch on source 60fps without any shuttering.

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LOL ahah ahaha