![]() The counterpart to % CPU is that the percentage not accounted for in % CPU is spent idle. This is complicated for Intel processors with support for hyperthreading, which adds a further 100% for each core, resulting in full % CPU rising to a maximum of 1600 for those same eight cores. If your Mac’s chip has 8 cores in all, then as each can run to 100%, when all eight cores are fully active, the total % CPU comes to 800. Total active residency is measured for each core, then added together. Thus, in a given 10 second period, if 25% of the cycles are spent processing WindowServer code, the % CPU for that period is 25%. It seems to be based on the active residency of each core, that’s the percentage of processor cycles which aren’t idle, but actively processing threads owned by a given process. ![]() It’s also misleadingly inaccurate on Apple silicon chips. % CPU is a rough measure of the amount of time on the CPU cores that a process has run, but isn’t a true percentage out of a hundred. To help you understand and compare them, I’ll try to explain what I think the less obvious numbers mean. Now there are also Apple silicon Macs, some of the figures don’t quite tally across architectures. ![]() When all Macs were Intel, even if we couldn’t necessarily define some of them, it wasn’t hard to work out roughly what each meant. Activity Monitor provides many different numbers for aspects of your Mac’s performance.
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