this post was submitted on 30 Oct 2025
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Old tests on old compilers run on old Intel CPUs may have regressions. I forget the details, but back when all this was new, some CPUs would downclock if they even *see *an AVX2/AVX512 instruction.
Modern CPUs (mostly) don't do that.
It also shrinks the packages some (so less bandwidth and client disk usage, at the cost of compile time/disk space on the host's side, which is a decent trade), and applications that show more improvement tend to be more intense anyway.