What Gives The Best Embedded Perl Performance?

ChetPan asks: "I'm doing some development for a couple of student-run sites at NC State University. We want to make dynamic portal-like customizable pages, but aren't really sure what to use to output the actual HTML, since the main concern here is performance. We have most of our code in Perl modules and we're wondering about the main (heavy traffic) pages. I don't know much about embperl or eperl and how they compare to regular mod_perl under Apache. Are there other embedded Perl solutions? Would we get a performance boost by using PHP? Unfortunately I haven't seen much neutral comparison of the different embedded types on the Web. I would especially appreciate seeing some benchmarks and/or statistics on the topic."