Microsoft Flight Simulator 2024 sucks up to 180 Mb/s of internet bandwidth
tomshardware.com
tomshardware.com
Obviously it's good for it to saturate your connection when it's loading the landscape for the first time.
And obviously this rate isn't maintained throughout your flight. Once the visible environment has loaded, it only needs to download new data at the speed of your airplane.
And I certainly assume there's heavy caching involved, for when you turn your plane around. :)