System Monitor

Known Issues

There are currently no known issues for this product.

Release Notes

Statistics for outgoing network data traffic may not work for specific combinations of macOS version and Ethernet chips: The “write” activity indicator, as well as the “outgoing packages” statistics value for certain Ethernet ports used in specific Macintosh models may not work with all versions of macOS. In such a case, System Monitor shows no write activity or zero packages for the affected network interface, respectively. For example, the “Aquantia Aqtion 113” driver of macOS 13 is affected by this problem. It is used by the 10 GBit/s port of the Apple Studio.

Workaround: This is a known defect of older versions of Apple network interface drivers. Upgrade to macOS 26 or later to fix this problem.

For very narrow menu-bar items, the Liquid Glass feature may cause display errors when the item is selected: macOS 26 introduced a new graphic appearance with glass-like optical effects and strongly rounded corners. Such design effects are also applied when macOS highlights an element in the menu bar after a click, such as a monitor item of System Monitor. If you configure a monitor item to be very narrow, e.g. by just defining a small vertical label as placeholder to hold a menu, with no other display elements in the bar, the Liquid Glass highlight for this item may look wrong. The strongly rounded corners and the reflections can work against each other in this case. For example, a bright grey highlight may turn into a black vertical eye-like shape.

Workaround: This is a known design flaw of macOS 26. There is no known workaround.