Most likely it is that the profiler on 5.10 can instrument BEGIN blocks, which it could not do on 5.8.8.

In reply to Re: Performance and Behavioral changes in Perl 5.8.8 and Perl 5.10.1 by Corion
in thread Performance and Behavioral changes in Perl 5.8.8 and Perl 5.10.1 by ManasMarwah

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