Does Dreamhost support mod_python?

Unfortunately, no. But you can vote for it on the Suggestions page. Search on that page for mod_python.

While I don’t have any empirical evidence to say that it would speed up MoinMoin, I’d like to think that it would. While I would like to stick with MoinMoin, it’s right at the edge of being too slow to use. I may have to give MediaWiki a try. Another option is to compile MoinMoin with psyco, but 1) I haven’t had time, 2) I’m not certain it will compile with psyco, and 3) I’m not sure the end result would run on a DreamHost shared server.

MoinMoin definitely does run under mod_python.