Soooo.... Lo and behold, Class::MOP 0.49 is out with significant speedups. Moose is also out with 0.33. Unfortunately, the new Class::MOP breaks Moose < 0.33, and Moose 0.33 breaks on Class::MOP < 0.49. The XS speedups in Class::MOP are on the order of 45% in terms of class load time for Moose.
This gives rise to a question of how to build new versions of 2 (or more) packages that are mutually dependent on each other? Unfortunately this isn't just a matter of building and then tagging both builds in bodhi. My understanding is that new builds will not build against testing (and I wouldn't want to break Moose in testing in any case). I poked around in the wiki but if the answer is in there, it successfully kept itself from me.
-Chris