If DB issues are considered to be so serious why not to make one more seam with db4o? http://www.db4o.com Christian, I feel a little bit confused. The log contains single SQL statement that is not related to the tree, due to the fact that tree model is kept in SFSB (visible nodes only). Aaaah! Something happened with me on yesterday evening. Rendering takes a second, not a minute. Sorry Norman, about a second. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4008319#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...