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YouTube might slow down your videos if you block ads
(www.pcworld.com)
This is a most excellent place for technology news and articles.
FWIW, I've been using ublock origin, too, and it's mostly worked fine.
Until a few days ago, when Youtube started detecting it and showing down the site and telling me I can only watch 3 more videos before it cuts me off. That hasn't happened yet, but I definitely feel the slowdown. I'm hoping a ublock upgrade will fix it soon.