I've been experiencing this issue for roughly a week now. That being when attempting to view a video on Youtube, the video never starts and infinitely buffers unless I refresh the page. The reason why I'm posting to this subreddit is because the issues stop when I disable my VPN, and I was wondering if anyone else has had the same experience as I've had.
I've searched this subreddit for those with similar problems, and whatever solutions shared didn't work for me (Ex: using WireGuard over OpenVPN, disabling obfuscation, setting MTU to 1280, etc).
Edit: It turns out the issue comes from http3 being bugged for Firefox-based browsers. https://www.reddit.com/r/firefox/comments/1dgit2u/http3_bug_makes_youtube_super_slow_with_ns/