Any tricks for speeding up cvsps?

Hi,

I'm trying to convert a huge cvs repository. I've left cvsps running for 
days. First attempt, stderr filled my disc with warnings about tags that
couldn't be associated with any one commit, without producing anything
from stdout. I'm now redirecting stderr to /dev/null, but it still just
sits there producing nothing.  Is git-cvsimport infeasible for large
repositories, or are there tricks I might use?

P.