Activity Monitor shows over 100% CPU: what it means
Why a process can show 200 or 800 percent CPU in Activity Monitor, how cores add up, and when a high figure is a problem.
Why does Activity Monitor show more than 100% CPU?
Each core counts as 100 percent. A process using three cores fully shows 300 percent; an 8 core Mac can show up to 800 percent.
When is high CPU a problem?
When it stays high with nothing happening, drains the battery or heats the Mac. During an export or build it is the Mac doing its job: find what is using the CPU.
How do I see total CPU instead?
The CPU Load graph at the bottom of the CPU tab shows the whole processor, and in Terminal:
top -l 1 -n 0 | grep "CPU usage"Common questions
Is 200% CPU bad on Mac?
Not by itself. It means two cores are busy; it matters only when nothing should be running.
How many cores does my Mac have?
sysctl -n hw.ncpu prints the number.