in reply to
Benchmarking A DB-Intensive Script
Using Devel::Dprof and dprofpp,
which are part of recent Perl distributions,
you should find out where your code is slow.
Regarding the database issues, DBI::Profile can
find which methods are taking too long (you can look
at Speeding up the DBI for suitable examples and tips).
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
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