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lang-bash
LC_ALL=C /bin/bashcuts the time from 1.537s to 0.695s on my rig, vs. 0.497s for/bin/dash.(export LC_ALL="en_US.UTF-8"; locale; time for x in {1..1000} ; do /bin/bash -c 'true' ; done )and got 1.60 s for LC_ALL=en_US.UTF-8 vs. 1.48 for LC_ALL=C.LANG=en_US.UTF8LC_COLLATE=CLC_NUMERIC=C. Doing the unmixed en_US saves about 0.2s on the loop but yeah your exact loop, it's repeatable for me on Arch,LC_ALL=Ccuts the startup times dramatically. Bash 5.2.26, maybe they're working on it? Haven't checked the changelogs.