Speeding up git svn

For those of use unfortunate enough to use (large) svn repositories I found the following has improved things slightly when you get the occassional

W: Ignoring error from SVN, path probably does not exist: (160013): Filesystem has no item: '/!svn/bc/101' path not found: Additional errors:: File not found: revision 101, path '/services/jet/mami/trunk/branches/PSDR-1139'
W: Do not be alarmed at the above message git-svn is just searching aggressively for old history.
This may take a while on large repositories

message (and it starts going through the repository from revision 1)

$ git config svn.brokenSymlinkWorkaround false

Obviously beware if you have symlinks in your svn respository.