I've got hundreds of apps on my Apple TV and lately its download speed has sometimes slowed to a crawl, but never as bad as this morning. Using Spectrum Cable today my iPad Pro downloaded at its usual 350 Mbps while the Apple TV at times was less than 1 Mbps! When it finally got up to around 10 Mbps I checked to see if there was a tvOS update, and happily there was. I downloaded and installed tvOS 12.2.1 and now my Apple TV is back to normal, almost as fast as my iPad Pro running iOS 12.2!
For me, this is a HUGE update. I've always been using my Apple TV far more than my Cable box since the day it came out back in 2007. It's nice that it is running perfectly again! By the way, here's how I've set mine up over the past dozen years:
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How are you able to capture Apple TV Screen like that?