System Monitor

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Issues or questions regarding the Mac App Store

Frequently Asked Questions

System Monitor

Known Issues

There are currently no known issues for this product.

Release Notes

The activity display may not be available for certain third-party network interfaces: If you are using an additional network interface on your computer which has not been made by Apple, e.g. a USB-to-Ethernet adapter, it might not be offered for monitoring at the network part of the System Activity monitor item, although it might be available for the Network monitor item.

Workaround: This problem is caused by missing functions in the macOS drivers for specific network interface hardware, for example Apple’s “Skywalk” Legacy Ethernet driver for macOS Catalina. Such drivers only implement basic features to connect to a network, but don’t collect the statistical information that is necessary for high-speed activity monitoring. Although you can monitor the network detail statistics of this interface with the Network item, you cannot monitor its live actions with the System Activity item. This is the correct and intended behavior. System Monitor will automatically start offering the affected interface for activity monitoring again when the respective macOS drivers are working correctly.


If you had set your preferences to monitor the storage space of one or more hidden volumes, these volumes won’t be shown by System Monitor 2.6 or higher: Older versions of System Monitor may have offered selected hidden file systems for monitoring, e.g. the VM volume that stores the swap space of macOS. Hidden volumes are mounted by macOS with the express wish that they should not be shown in user applications. These volumes are no longer displayed in the VOL section of the menu bar or in monitor preferences.

Workaround: This is the correct and intended behavior. System Monitor now strictly follows the guideline not to show volumes which are expressly marked with the “don’t browse” option of the operating system. Due to the increasing use of hidden volumes in modern versions of macOS, this avoids confusion, e.g. with the swap space volume, local Time Machine snapshots, App Translocation volumes, or the data part of the Catalina system volume.