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Regarding tweaking your networking settings, there's a application that can help! (TCP Optimizer)
This tool I generally always use when I reformat my PC, and comes with various optimization methods you can adjust for gaming or streaming. No need for command prompt, just run the file with administrative privileges and configure it to your liking (you can use optimal, but it doesn't adjust nagle and tcpnodelay attributes by default, you have to manually change those in the 'advanced' tab).