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YouTube is slowing down for users with ad blockers in new wave
(9to5google.com)
This is a most excellent place for technology news and articles.
Same, YT Premium, Firefox, ad blocker, no issues with streaming.
So, since writing the above I've been having issues with YouTube. I've been connected to my VPN, so perhaps that's part of it (by which I mean Google slowing it down, the VPN doesn't noticeably slow down any other sites).
I tried deactivating my ad blocker, but it hasn't made a difference. I'll try more stuff to see if I can figure it out.