That's exactly right. Perl 5.10.0 accidentally disabled a list assignment optimization. Perl 5.10.1 re-enabled that optimization and a lot of functions which perform list assignment from @_ run faster under 5.10.1 than they did with 5.10.0.

In reply to Re^4: Much slower DBI on RHEL6 by chromatic
in thread Much slower DBI on RHEL6 by MPM

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