Are There Perl Optimization Guides?

ara818 asks: "I have written a 4,000-line personal web assistant using Perl. After getting everything to work I am now working on making the code run faster. The problem I keep running into though is that there are so many ways to do the same thing in Perl that I don't know which is faster. Right now, I am working on intuition but I'd really like a site or book that could give me at least a few pointers or some guidelines. Is there any such resource available for Perl, or for that matter, other popular programming languages?"