
MenuMeters appears as an extra item at the bottom of the System Preferences window. MenuMeters adds up to four optional items to the menu bar: CPU, disk, memory and network. Each of these is configurable and you can choose from several different display styles depending on how much information you want to see. You can see two examples of these optional indicators in the screenshots above. For example, with the CPU indicator you can choose a percentage, a graph, a graph and percentage, a thermometer, a percentage and thermometer, a graph and thermometer, or graph, percentage and thermometer. The other items, disk, memory and network, also have numerous display options.
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Some of them require more menu bar space than is available on small screens and you might be forced to choose the most compact display options on a smaller MacBook for instance, but you can display more information on a MacBook Pro with a 15in screen and there is obviously more than enough menu bar space on an iMac with a big screen to choose any options you like. The colours of each item in the menu bar can be changed. The defaults work fine with the traditional light macOS interface, but are too dark for the dark theme. Select a colour at the bottom and it can be changed though.

I selected lighter colours to make them easier to see with the dark theme.

The menu bar display indicators instantly tell you how hard the Mac is working behind the scenes. They show whether the disk is being written to or read from, how hard the processor cores are working, the internet transmit and receive speed when data is being downloaded or uploaded, and so on.

This is all valuable information and it tells you what you Mac is doing when there is nothing obvious happening on the screen. One way of using this information is to wait for the CPU, disk and network activity to zero before shutting down the Mac.
