This is to decide whether to buy an AppleTV 4K or not:
For example, some areas may have an 18 to 22Mbps Internet connection, and is just about 10% to 20% lower than the official recommended 25Mbps.
And since the 4K movie cannot be downloaded but can only be streamed, and will be "downgraded" to the next lower resolution (from 4K to 1080p), will a connection of 18 to 22Mbps be able to stream a 4K movie?
- If it is not an action movie, it may not require 25Mbps.
- If it is 22Mbps, it is about 10% less than the recommended 25Mbps, so if Apple TV can buffer up 10% of the movie: 9 minutes of it out of a 90 minute movie, then mathematically, the whole movie will play till the end smoothly if the user is willing to wait for 9 minutes of start time, or even a 4.5 minute initial wait plus a middle intermission restroom break of another 4.5 minutes, instead of not being able to see it in 4K at all.