The problem here is the version available into BT4 repository which is 1.1-1.1 (libxcb1, libxcb-xlib0)
This version has bugs noticed when using gnome through xdmcp, here is:
#487635 - Performance degradation over remote ssh X11 forwarded display - Debian Bug report logs
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Last edited by Anderlfs; 03-09-2010 at 05:22 PM. Reason: grammar