Speeding up the initial git-svn fetch

I have a big repository, 100,000+ revisions with a very high branching
factor. The initial fetch of the full SVN repository using git-svn has
been running for around 2 months and it's only up to revision 60,000.
Is there any way to speed this thing up?

I'm already regularly killing and restarting the fetch due to git-svn
leaking memory like a sieve. The transfer is occurring over the local
LAN, so link speed shouldn't be an issue. The repository is on a
dedicated machine backed by dedicated fiber channel arrays so the
server should have plenty of oomph. The only other thing that I can
think of is do the clone from a local copy of the SVN repository.

What have other people done in similar circumstances?