I have intentionally disabled the JIRA plugin in Confluence to see if that makes any difference.
I've got a sneaking suspicion (fueled by some jstack and lsof output) that Codehaus is stalling our HTTP requests, and that a sufficient number of these causes Confluence to lock up. Each roadmap view makes at least 6 HTTP calls, so it's not unreasonable.
-Arne
--
Arne Kepp
OpenGeo - http://opengeo.org
Expert service straight from the developers