How to Find the Link Speed of a Mac

Open a new Finder window by clicking on the icon in the dock.
Navigate to the 'Utilities' folder, which can be found in the 'Applications' portion of the Mac hard drive.
Double-click on the 'Network Utility' icon to open the networking program.
Click on the 'Info' tab at the top of the application window.
From the 'Network Interface' drop-down menu, select the network adapter whose speed you wish to look up. The speed of the connection will then appear below.
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