[xwiki-users] xwiki Blog trouble

Hi guys, We are experiencing serious performance problems with the Blog application. We cloned it in version 2.1 and did a few minor mods. We have under 1000 blog entires now in about 60 categories, some are subcategories. Loading the category management page takes about a minute. I have seen no big database activity, there is mostly a load on the cpu of the application server. Does anyone know how to fix this? For example when looking at the add a post page, the same tree is displayed there, but loading is much faster. I was trying to load the tree in a simple way and add the add category functionality, but it rather a PITA. We have multiple people using the Blog at the same time, does anyone know a fix? Kind regards, Vincent Gerris