View network activity in the Activity Monitor window or in the Dock.
Click Network in the Activity Monitor window to see the following:
Packets in, Packets out: The total number of packets received and sent.
Packets in/sec, Packets out/sec: The speed of information being transferred (in packets per second).
Data received, Data sent: The total amount of information moved (in megabytes).
Data received/sec, Data sent/sec: The amount of information moved over time (in bytes per second), also called “throughput.” This number is also displayed in the graph.
To make more columns visible, choose View > Columns.
Choose View > Dock Icon > Show Network Usage.
In the Activity Monitor window, you can change the type of data displayed in the network activity graph. The type of data you select is shown in the Activity Monitor window and in Activity Monitor’s Dock icon.
Click Network in the Activity Monitor window.
Click the pop-up menu above the graph and choose Packets or Data.