I'm not sure what your client is looking for. Does the client want to know if your code is faster than something else? If the code is fast enough, than it's fast enough. (Sometimes phrasing something that simple is what it takes to convince people).

Other options:

• Devel::Dprof
• Devel::Profile (I like this module. Easy to use and it doesn't segfault)
• Devel::Profiler (A replacement for Devel::Dprof)
• Ask the client what number he or she wants, write it down on a piece of paper and hand it back.

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