Book "Perl Best Practices"</a> by Damian Conway - contains a lot of good
advice and food for thought, but sometimes should be deviated from.
If all else fails, then re-impelmenting the slow code in a faster language
-or <a href=http://en.wikipedia.org/wiki/C%2B%2B"
">C++</a> and embedding it
+or <a href=http://en.wikipedia.org/wiki/C%2B%2B">C++</a> and embedding it
inside Perl is an option. Here are some alternatives for writing extensions
to Perl in C and other languages that are compiled to machine code:
<a href="http://en.wikibooks.org/wiki/Programming:Perl">"Programming Perl" in
the wikibooks</a> - a Book about Perl programming in the Wikibooks project.