Poor performance after upgrade to 1.4.5

We've upgraded to SVN 1.4.5, with apache 2.2.6, mod_dav_svn, mod_authz_svn,
and bdb 4.6. We were running SVN 1.3.1 and apache 2.0.52, bdb 4.2. This is
running on a FC3 box with 2.6.11, using source builds of svn, bdb, apache,
and dependencies. [Hmmm... I just found a thread suggesting bdb 4.6 isn't
"officially" supported, although it seems expected to improve performance]

We upgraded to get all the performance/stability improvements we were
supposed to get. But now when our build system does simultaneous checkouts
(25 or 30 'svn co' from different hosts) the web server gets pegged, and the
concurrent checkouts which used to take 10-15 minutes now take 4 hours.

Nothing unusual showing up in the logs or anywhere. Any suggestions on what
might be happening, or what we can do to diagnose things? Our repository is
about 13000 files, 80mb

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