The update center census stuff takes a stupidly long time. I can get it to go faster, but that requires bumping the Mongo version and more memory (and probably more disk!) - I'd like to move the actual generation to another host, with rsyncing of /var/log/usage-stats from cucumber to the other host, a new job that actually runs the census updating on that other host, then stashes/archives it, and finally unstashes/unarchives it on cucumber. Or something. I'll work on it.