As a preface, I watch a lot of #AppleTV content in 4K hdr on a Chromecast. It works great.

That said, I am basically unable to watch MLB or MLS content on it (which is 1080p at best, and definitely not HDR). It just horribly stutters.

Watching on an older TV with a Chromecast HD (limited to 1080p) has no such problem…
@TheBruce what's the display?
@4d3fect It’s an LG C1. Anything other than live sports works great