Profiling Perl

Before I can do anything to improve my programs, I have to make a decision about what I am going to fix. Before I spend the time to do that, I want to figure out what I should focus on. How do I get the most improvement for the least amount of fiddling? What should I work on first? Through the process of profiling, by which I record and summarize what a program is doing, I can make those decisions. Luckily, Perl already offers several tools to do this.