Wouldn't be the problem as when I use my iPad, iPhone they work decently. But the second I use the "Mac" version, even on my New MacBook Pro 16", sorry but, the app is just horrible in general. FYI, I run a dedicated ethernet cable over a 20MB Internet connection. Blazing fast and most usually perfect for other streaming services such Netflix, AmazonPrime...
I'm just very surprised the Apple TV service is so variable and usually problematic. Maybe its just my region where video distribution servers may just be bad or average at the most... But then again, on iOS it's usually much better. How knows really. But thanks for your time.