A few weeks ago I sent an email saying that I'll be doing some benchmarks of Dfly, other *BSDs, Linux and OpenSolaris. The results are up on my site if you are interested http://www.fosstools.org Dfly did OK, very close in performance to FreeBSD (which is not surprising given that Dfly is a fork). The big surprise was OpenSolaris, which performed very badly in the DB tests.