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When Baldur's Gate 3 came out, Steam's overall bandwidth consumption went from around 18 Tbps to 146 Tbps
(reddthat.com)
From Steam's self-published stats.
Baldur's Gate 3 could not be preloaded and weighed in at 125 gigabytes on disk, so when the game left Early Access at 11am US Eastern yesterday, Steam's bandwidth utilization shot up 8x over a span of 30 minutes. I know personally, I saw my download hit over 600 Mbps across a 1 Gbps fiber connection.
Kudos to the system engineers at Valve. It is mind-boggling that they have built infrastructure that robust.
And on Windows it's so poorly implemented they had to reserve 20% of bandwidth for updates being uploaded and downloaded and you don't get a choice on that. So when Windows is sharing its updates your internet access suffers.
Jokes on windows, my WiFi is just funky enough that transfers between devices on LAN run like dogshit so it gives up before it even starts!
...I really need to invest the time into finding & implementing a better network solution
Go with old 10BASE2 network topology. Nothing beats 1Mbps which might randomly stop working due to missing terminator somewhere in the network.