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Google is intentionally throttling YouTube videos, slowing down users with ad blockers
(www.windowscentral.com)
This is a most excellent place for technology news and articles.
It's not perfect, but I use grayjay. They have an android app and a desktop client, and are usually pretty quick to make updates that will sidestep Google's anti-adblocking measures (within 1-2 days.) Again, not perfect, but I don't mind a slightly worse experience to avoid having to see an ad. Plus it has sponsor block support built right in