Mendix action get_session_data

Is it possible to restrict the mendix xas action "get_session_data"  call to not download the entire database metadata during the establishment of the session. At the moment this ia a 1 Meg download for each of our users at the beginning of their session. This is causing us performance issues with regard to the logon as we already have to down load all the css, and javascript files.   Many thanks Allistair
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