in reply to Low-Impact Symetric Cypher for Perl Programs?
I'm sure it's pretty slow (the docs would seem to agree), but maybe speed is not the main thing you care about.
The only drawback with it is that is built-in CBC is not compatible w/ Crypt::Rijndael in CBC mode. I don't know why, that's just what the docs say. This could potentially require you to use Crypt::CBC for compatibility purposes.
If you really do want speed, check out Crypt::Rijndael. It is self-contained, in that it has a built-in CBC mode, so you don't need to rely on Crypt::CBC. It is XS, however, so that may be a potential turnoff for you.
(BTW if you feel like it keep me posted on your work with Crypt::OpenPGP; I'd be interested in hearing what you're doing with it. :)