Mac is using 100% CPU while it is OFF I have a
MacBook Pro (Retina, 13-inch, Early 2015)
MacOS High Sierra 10.13.2

Sometimes my mac using a lot of CPU power. The usage is 75% of the system. But this occurred when I was away and the mac was in the sleep mode (I went away at about 11 AM till 8 PM). Also, the "User" usage is used more power than even when it is on. Does my Mac has some problems or is this behavior normal? Can it be a Virus?


I checked the last 30 days. It happened more than ones. They are lasting for about 3 days...
I'm wondering if this is the "Power Nap" feature of macOS...

Check System Preferences > Energy Saver

Is Power Nap checked? That feature will let the Mac do some things in the background while sleeping. Things that use little actual battery power. That is shows 100% CPU usage is odd, so I am not certain this is Power Nap.