XS has a surprising amount of overhead per call copying parameters in and out. When I was writing Lingua::Stem I was able to achieve 80% of the speed of Lingua::Stem::Snowball (which uses XS) for stemming in place and actually beat Lingua::Stem::Snowball by 30% for large straight list processing.

In reply to Re^2: When every microsecond counts: Parsing subroutine parameters by snowhare
in thread When every microsecond counts: Parsing subroutine parameters by snowhare

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