I haven’t experienced it either, but Google also typically rolls out changes in waves. They rarely just push to prod and call it a day. They push changes in waves, so they can pull the update or make adjustments if the early waves have issues.
Really? I switched from Edge to Firefox recently and YouTube slowed to the point it takes minutes to load the home page and several refreshes. Actually, most Google pages, but YouTube is the one I really use these days.
The videos themselves load fine, and of course every other website loads fine at the same time, but YouTube is nearly unusable if you can't even get to the video in the first place.