svn to git, N-squared?

I have Mozilla CVS in a SVN repository. I've been using git-svnimport to import it. This time I am letting it run to completion; but the import has been running for four days now and it is only up to 2004. The import task is stable at 570MB and it is using about 50% of my CPU. It is constantly spawning off git write-tree, read-tree, hash-object, update-index. It is not doing excessive disk activity.

The import seems to be getting n-squared slower. It is still making forward progress but the progress seems to be getting slower and slower.

It looks like it is doing write-tree, read-tree, hash-object, update-index once or more per change set. If these commands are n-proportional and they are getting run n times, then this is a n-squared process. Projecting this out, the import may take 10 days or more to completely finish.