Comment by TheAceOfHearts

I've had this slow down show up for me as well. I wonder if there's a non malicious explanation, although I'll admit I'm unable to think of a charitable interpretation.

Sometimes YouTube also disables features on my home page. For example, at the top of the home page there's usually a filter bar with various categories. I haven't figured out under what conditions this gets triggered, but there's times where the filter bar just disappears.