in reply to Any Book Recommendation
Perl Programming 3rd edition has an entire chapter (chpt. 23) devoted to security. Chapter 24 has a number of tips and tricks for making your code more efficient, for coding more efficiently, for making your code extensible... This is a great place to start.
Advanced Perl programming is great, but kind of dated, and alot of Advanced topics seemed to be incorporated into Progamming Perl.
I like a book called Effective Perl Programming by Joseph Hall. Its not that long, but some great stuff on efficient perl.
If you could purchase only one book, I'd get the Camel... Programming Perl 3rd edition.