Chat: between 600ms and 1.2s each time you display a page in edit mode spent in the chat

I find the edit mode very slow. So I did some quick YourKit stats in order to display my home page (with about 20 other pages in my top navbar whose certain use the Nstep) in order to know where does this feeling come from.

1) The new workflow states looks like taking a lot of time in order to be refreshed (the small lopping logo for each workflow state on my 20 pages)... But this should be a Javascript feeling on my browser (IE6) as on the server side, this does not take so much time...

2) The Chat (and a bit less the pdisplay) takes beween 700ms and 1.2s in order to perform the org.jahia.ajax.chat.chatAction.execute. And my chat for my current user (root) is not activated! So please
a) we do not need to make any AJAX call if the user did not turn on his chat... (property set somewhere in a user property or in the session).
b) why does it take so long?