And to add caching - Memoize!
As for actual profiling, its really easy to run your scripts under Devel::DProf (which comes with perl don'cha know) `perl5 -d:DProf test.pl` and after its finished, dprofpp. Sooper easy. I worked out an order of magnitude increase in some perl code speed by repeatedly testing my changes and assumptions against profiled code. And for those that are curious - it turns out that regex capturing can be a real dog some times.
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