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#!/usr/bin/perl -w
use strict;
...
    print "Processing time was...\n";
    print timestr(timediff($end, $start)) . "\n";
}

Loop using $ENV{PATH}: 12 wallclock secs ( 0.13 usr +  0.15 sys =  0.2
+8 CPU)
Loop using $foo: 11 wallclock secs ( 0.07 usr +  0.05 sys =  0.12 CPU)