I had a pretty poor experience on Saturday with the Blues v Dogs game on my LG tv. There was a constant loading image showing a percentage on the screen, which was also dimmed, after 5 seconds or so of streaming.
A fix I found was to stream on my phone and use Airplay to connect to the tv - the buffering and loading issues disappeared. Presumably the component used in my iPhone 13 Pro Max is better than the one used by the tv to connect to my home WiFi.
I had the same issue on my LG trying to watch the NBA on Saturday. Apparently only affected the LG interface according to Kayo. Was fixed by Sunday but still pretty bloody frustrating.