Well, I've disabled the CPAN nodelet as you and elusion
have suggested, and that has definitely improved things, though the problem persists. About every ten minutes, I have to wait a minute or two before pages start loading again. I'll try systematically removing other nodelets to see if I can narrow down the problem.
Regarding your suggestion of visiting the offering plate, I would venture that this is more of a task for pmdev than anything else. I doubt that throwing extra hardware or bandwidth at this problem will resolve it.
s aamecha.s a..a\u$&owag.print