To find Activity Monitor on a Mac, go to your Applications folder > Utilities folder, and then double-click Activity Monitor. In this article, I’m going to introduce you to Activity Monitor, and explain how this utility can help you find-and, in some cases, resolve-problems on your Mac. One of the tools you can use to troubleshoot problems on a Mac is Activity Monitor, a dashboard for many of your Mac’s under-the-hood activities. Narrowing down the cause of such problems can be difficult fortunately, macOS offers some troubleshooting tools you can use to diagnose what ails your computer. Sometimes some of your apps don’t work, your Mac gets slow, you get a spinning beachball, and more. We never like to have problems with our computers, but they are inevitable.
Make sure Windows => Keep CPU Windows on Top is disabled (unchecked).Software & Apps How to Use Activity Monitor to Troubleshoot Problems on a Mac The example below shows a mostly idle system. Green represents CPU utilization by user applications, red represents CPU utilization by Mac OS X itself, and blue indicates low-priority tasks. The history graph ( Window => CPU History) can be sized wider to show CPU history over quite some time ( View => Update Frequency). Unfortunately, they can be shown only one tab at a time (you can’t watch Disk Activity and Network at the same time). Observe the tabs at bottom ( CPU / System Memory / Disk Activity / etc). You might find that some “vampire” programs waste CPU time when doing nothing useful- these are programs you don’t want to leave running when you’re not using them! Disk and network activity One CPU core represents 100%, 2 CPU cores is 200%, etc. The remainder is being used by WindowServer, DreamWeaver, etc. The example below shows a MemoryTester (dlt) test in progress, taking 364.7% of the available CPU cycles. This makes it easy to see which applications are using CPU resources. Sort by percentage CPU usage by clicking on the CPU column (triangle should point down as shown). Quad-core CPU history in Activity Monitor (mostly idle)
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