Taking really long time to get stats

Is it normal for hoc to take an extremely long time to run?
It took 268.66s for hoc to run on a project with 3006 commits with ~1.5 million lines.

I'm wondering if you could add the option to tell hoc what pre-generated log to look at? This might speed up the process since we could eliminate the network-part. And I'm guessing that it's the `svn log --diff` that takes the most amount of time.
