Debug prints such as yours entail a runtime hit, which is almost always negligible; but they also clutter the code, which often isn't.
If you use something like this: 
use constant DEBUG => 1;
print "Some useful information"
  if (DEBUG);

[download]
the compiler should optimize it away, which will remove even the small performance hit (or at least relegate it to the one-time compilation of the code).

--
sgifford's Web page

In reply to Re^2: Using the Perl Debugger (-d) by sgifford
in thread Using the Perl Debugger (-d) by Melly

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