GOODS speed

I'm about to post an updated fulltext search package to SqueakMap, but
in the process of testing it, I've been a bit underwhelmed by GOODS'
performance. I built a sample database on 2 MB of emails. Committing
the indices to GOODS takes several minutes, and once they've been
committed, running a search on them takes about 750 ms. In comparison,
actually building the indices takes only 30 seconds, and doing the
search in-memory takes about 1 ms. A similar query in PostgreSQL on a
far larger dataset executes in 50 ms, for comparison. Are these
performance times typical? If not, what can I do to make them run more
quickly?

Thanks.

--Benjamin