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That's a big jump. Is there a way of getting Linux to disable a couple of cores?

`echo 0 > /sys/devices/system/cpu/cpu[0-n]/online` should do what you want.

Even as root, that gives `permission denied` on Pi OS on the Zero 2 W. I'm trying the kernel cmdline option too.

Well… I said it should, not that it would. ;-)

On x86 there was an option, i think nr_cpus or something like that some time ago. There was also SMP_KERNEL kernel config option.