I've only been using this extension for about an hour so far, but it's allowed me to go from ~35% CPU usage to around 5% CPU usage while watching the same stream at 480p on my laptop. The only problem is that when I try to type in chat, it tells me "Login will open in a separate window." and then when I click the Log In button, I see "Login was cancelled, please try again."

This, however, is not a problem for me because I use Chatterino on the side and the overall CPU usage is lowered by so much that it's worth the minor inconvenience.