Did you read my final notes in the node?

"But always remmember, only spent time optimizing your code in areas that will be executed a lot of times, specially inside loops."

"And don't make code optimization a jail. Perl is wonderful because we are free to do our code how we want..."

And yes, Devel::DProf and Benchmark are very good! ;-P

Graciliano M. P.
"The creativity is the expression of the liberty".