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Your TV set has become a digital billboard. And it’s only getting worse.
(arstechnica.com)
This is a most excellent place for technology news and articles.
You can check to see if you can enable hardware transcoding. I find the delay is usually transcoding building up a buffer and if you have a good GPU/APU in your server it's often a lot quicker.
Pretty sure on jellyfin by default that is off. Mainly because you need to install some packages to get the devices available under linux usually.