You are looping over all of the %ext keys, and provided that $ext{$6} 
exists, assigning a value to $tad for each key. Therefore, the final value 
of $tad will always be the same, i.e. the one determined by the last key.

>       foreach $key ( keys %ext ) {            #
>               if (exists $ext{$6}){           # This is the time 
consumer
>                       $tad=$ext{$key};                #
>               }
>       }

Try using the following in place of the above code.

        $tad=$ext{$6};

It should work and perform about 3000 times faster than your loop (based 
on the size of your key file).

Tim
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