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Benchmark: timing 100 iterations of w/o study, with study, with study 
+in loop...
 w/o study: 346 wallclock secs (306.95 usr +  8.69 sys = 315.64 CPU)
with study: 317 wallclock secs (301.91 usr +  8.53 sys = 310.44 CPU)
with study in loop: 369 wallclock secs (347.37 usr +  8.39 sys = 355.7
+6 CPU)

#!/usr/local/bin/perl -w --
use Benchmark qw(timethese clearallcache);
...
        (stat($filename))[7], 
        "\t");
}

Benchmark: timing 100 iterations of w/o study or /o, w/o study with /o
+, with study and /o, with study w/o /o...
w/o study or /o: 352 wallclock secs (304.41 usr +  8.55 sys = 312.96 C
+PU)
w/o study with /o: 388 wallclock secs (253.90 usr +  8.33 sys = 262.23
+ CPU)
with study and /o: 881 wallclock secs (507.50 usr +  8.17 sys = 515.67
+ CPU)
with study w/o /o: 823 wallclock secs (597.40 usr +  8.31 sys = 605.71
+ CPU)

#!/usr/local/bin/perl -w --
use Benchmark qw(timethese clearallcache);
...
        (stat($filename))[7], 
        "\t");
}