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Jan 4, 2016 7:03 PM in response to calipvpby Grant Bennet-Alder,When they are connected to your Router, they are only using the Switch function -- their data is not Routed. They are essentially communicating directly. But your Router must support Gigabit transfers, even if it cannot talk Gigabit over the Internet connection. (Apple Routers do support Gigabit ethernet.)
One explanation for the slower speed is if either computer is limited to 100BaseT. One surprising thing that can do this is a broken wire in a cable. You must have all eight wires in the cable, and they must be connected correctly to attain Gigabit Ethernet speed.
There is an instrument available to report ACTUAL speed -- it is Network Utility. If Network Utility.app it isn't found in your Utilities folder, look for it here:
/System/Library/CoreServices/Applications