As for the other OS, the culprit was clamav. Fortunately, they also provide clamav-lts, which doesn't need Rust to build, so I'm changing over to that.
And I've been messing around with SMT settings in my BIOS, thinking that was to blame. (I had it disabled on my last MB but it was enabled here so I disabled it for comparison. It made my CPU load look half as big, but of course that was just because I had twice as many virtual cores, so the monitor thought I was using less of the imagined double capacity!)
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