And even then, with this test, while it's fair in how fast it accesses, the real concern would be the speed in breaking down the query string. I propose a better test would be :

use Benchmark;
use CGI qw/:cgi /;
use CGI::Simple;
$ENV{'QUERY_STRING'} = 'foo=bar&baz=boo';
timethese(250000, {'CGI' =>
                      '$q = new CGI; $q->param("baz")', 
                   'Simple' => 
                      '$s = new CGI::Simple; $s->param(
+"baz")'});
[download]

-----------------------------------------------------
Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain
"I can see my house from here!"
It's not what you know, but knowing how to find it if you don't know that's important