I dunno exactly what to answer. This is a valid request and makes sense and is more or less possible.
But I tend to say, that it is much easier to have a faster internet-connection instead of having 1-2 developers spend 3-6 month (plus added complexity and bugs).

I agree with you. Faster internet ...

I know this won't effect many people but it is a quality of life for the better for everyone.

Currently when you connect to a multiplayer map it downloads the entire save *.zip file and then "catchs" you up to whoever is hosting.
This can be bothersome when you have a slow connection, especially if ...