Devel::FastProf is a perl per-line profiler. What that means is that it can tell you how much time is spent on every line of a perl script (the standard Devel::DProf is a per-subroutine profiler). The former Devel::SmallProf accomplishes the same task, but it is much slower. Devel::FastProf is only 5 to 8 times slower than normal execution.
WWW: http://search.cpan.org/dist/Devel-FastProf/
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