Slowdown / lockups reading helpfiles

I'm having a rather odd issue and am having no luck googling.

Whenever I try to load a helpfile, the response time is _extremely_
slow, sometimes to the point of locking my window for upwards of 10
seconds. Also, CPU gets pegged by the Vim process. True of macvim and
console vim, it feels like macvim is getting harder hit, but that's a
very subjective perception. This only seems to happen loading
helpfiles, everything else I do in vim seems to be working just fine.
I am working under the assumption that this is due to some plugin that
I have recently installed, and so I'm going to probably just deal with
this by stepping through disabling them until stuff works again. But
it strikes me as odd that any plugin could do anything to just affect
the reading of helpfiles.

So, any pointers or tips for narrowing down the culprits here?

[Mac OS 10.7.3, vim 7.3]

Thanks in advance,
-- Steen

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