This is all great info but quite frankly will impact very few players as most of the issues reside with the network architecture not being dedicated. The fact that Bob's xbox/PS4 on a consumer network and hardware is hosting your game instead something more appropriate for a AAA title like AWS or Azure isn't something that local configuration will ever overcome.
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Yeah, but in the mean time ...
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......acknowledge that it's screwed and there is very little you can do yourself to fix it :)
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At least I can say 100% that its not my LAN or any devices connected. :)