I didn't make it!
I know this has probably been asked before, but I couldn't find a thread about it. Is there a way I can make it so that someone only has to download a map they don't have, like the old way in Call of Duty: UO? Thanks for any replies.
check out this thread:
It explains something called the "csv bug", which means that maps which have a csv file are all downloaded all at once to the client on connect.
Follow bullet_worms instructions and you will see that its possible to make it so that only the map used in the rotation will be downloaded to the client as and when they are needed - and not before.