I've had something similar happen starting maybe a year ago, and varying in intensity from "no problem" up to "pegged CPU in the youtube tab and UI actions can lag up to several seconds". It doesn't affect video playback though.
This behavior comes and goes over time, for example it's been fine for several weeks in a row now. I assume it's punishment for running an ad-blocker.
This behavior comes and goes over time, for example it's been fine for several weeks in a row now. I assume it's punishment for running an ad-blocker.