I feel you. Where are you located? I’m from Europe and already talked about this with my ISP and the answer is simple: the servers of FS2020 are located in LAX, USA only, so the further you are from them, the worse the speed. I get max 10 Mbit/s download speed, but usually 4-8 Mbps :(. Every single update is a pain. And sometimes the game looses all the data just like that, so redownloading the whole thing is a real pain to me. I made backup and it saved my life already twice in 2 months.
The funny thing is that the servers are not Azure, but Amazon AWS! Weird as for MS Studios signed production…
They made it so weird, that it takes no advantage of Windows 10 built in optimized software delivery, which uses other computers to get the software from in parallel to their own servers.