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I wonder if the plot would look similar if you disabled hyperthreading but kept the same number of workers.

Ah I _think_ I ran this on a MacBook that as far as I know has 8 real cores…

But I since found that 4 are “efficiency” cores, so that could be the reason for the poor scaling(?)

Seems plausible to me. The efficiency cores seem to be clocked quite a bit lower.