On our system:
$ find lib -name '*.pm'|wc -l
Just loading the classes, prior to connecting to the database (we've verified this):
$ time perl -MPIPs -e 1
23 seconds. While Test::Aggregate makes this pain go away when running a bunch of tests, the stereotypical tweak, test, tweak, test, tweak, test development cycle sort of grinds to a halt.