It was mentioned to me to try to use fastperl in place of /usr/local/bin/perl - regular perl - for my scripts. Has anyone used fastperl? Are there limitations I should be aware of? Pros and cons? Any real-world examples?
I've never heard of it untill now. Google gives this thread as the first related result (after a consulting firm with the same name). So no, I don't have any experience, and it isn't installed on my machines. If you are able to install additional software on your webserver, looking into modperl or fastcgi might be the better way.
Maybe you're talking about FastCGI? I've used it some. What it does is keep the script running, so it doesn't have to do things like open a database every time it's run. On my host I still start my files with /usr/bin/perl, I just use the extension .fcgi instead of .cgi. Here's a good page on the subject: