Youtube serves AV1 video these days, which needs CPU rendering on older machines. It might become usable if you switch it to 144p resolution. (For reference, such low-resolution video was very common in the mid-1990s, so it's not wildly out of place on a machine from 2010.)

Perhaps, but running on an 2010 Atom, you don't even get to press the play button of a video within one minute. That was the point, I believe.