Performance: Worfklow sitemap display is very slow even after having fully loaded workflow status: getMainLinkObject is the guilty one

I imported the online demo and validated everything. Then I rebooted without any of the preloading activated (no workflow status, no acl preloading, time based expiration HTML cache -= with the new options from Serge).

Then with the root user, after the reboot, I open from the home page the full sitemap (minimze and then extend everything). The first time is very, very slow due to the workflow states calculation. But the second time I try to reopen the full sitemap, the whole display is still very slow. According to JAMon (cf screenshot) this looks like related to the getMainLinkObject.

Does Serge modified something in there if we do not preload ACL or the workflowstates? I will try by reactivating all the default options, but if I remmeber correctly the display of the workflow sitemap was much more faster with the first options (but there is no reason there is a difference at least the second time I go through the workflow sitemap as everything should then be in cache isn'it?)