doyce, Youtube has started throttling the speed of any browser that's running an adblocker.
Doesn't affect me normally, but I couldn't upload the latest Masks game on Firefox because the upload speed was so slow it was failing out at about 14%/12 hours.
if I do it in chrome (no adblocker, for this and similar use cases), it's like 7 minutes, total.
This is a solid move by Google. Forcing people to watch ads and punishing people who won't has famously worked out well for every industry.