I wouldn't have predicted such a dramatic performance disparity across Perl versions. Have updated my benchmarking post with "(Perl v5.14.2 64-bit)" - which I now think should always be included in benchmarks. Greatly appreciate your informative reply!

In reply to Re^3: Best method to diff very large array efficiently by Kenosis
in thread Best method to diff very large array efficiently by newbieperlperson

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