Andrew, In my experience, TCP/IP seems to have about 10% overhead, but if there are packets from other sources going over the same link, if trying to put over about 10% of the total bandwidth down a link collisions start causing slow down.
TCP/IP is a great protocol, but designed for a 'not so busy' network IMHO. It works great if you are over provisioned. (I got into this with our network guru when I worked at a bank. We had branches with T1 links, we had about 1/3 cut off for VOIP, and the rest was TCP/IP. Doing backups remotely over the TCP/IP link were excruciatingly slow, and we tracked down about 98% of the bits before I was satisfied. There is a lot of various overhead related things that go down the protocol stream that all 'add value' but also get in the way, IMHO.)
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