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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.