Create a LAN Cache setup 

https://lancache.net/ is a DNS cache server that will download any game client updates to the cache server, and redistribute it to your LAN instead of having to go through to the ISP again. This is nice because my wife and I both play the same kind of games (Civ 6, fortnite, overwatch, etc) and there are times where we are both having to download the same updates. This would make that go faster :)