My activity monitor shows 24 lines of cpus.

That would be nice, but I have only 12 cores. Has anyone else seen this?

I thought that was possible but appreciate the validation.
What originally caught my eye was that only every other line in the activity monitor showed any activity. So I ran the hardware diagnostics to see if there was anything amiss. No problems were found. So it looks like the hyperthreading is not being used, but all the cores do participate to some extent.
I was involved in the signal processor industry in the 80s when the use of multiple processors was really getting going. Our system was synchronous, but even so, required a lot of planning to use efficiently. My work is mainly finite element analysis, Monte Carlo simulation and image processing, all of which can be programmed in parallel, so I expect to benefit from it at some point. So far 20-35% that you note is pretty accurate.

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