Here's a slight variation of the outputting format, but definitely while and $. are speedier. 

use strict;

open my $hndl, '<'."bigfile.txt" or die "Open of bigfile failed $!";
while (<$hndl>) {
   print sprintf("%  7s",$.) . "  $_ \n";
}

close $hndl;

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In reply to Re: speeding up script that uses filehandles by hsinclai
in thread speeding up script that uses filehandles by Anonymous Monk

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