Created attachment 2063 .xsession-errors When I log in, I see the Xfce mouse blinking for 1:23 minute. This happens, because all the Xfce components have already been saved in my session several times. My $HOME/.xsession-errors: (see attachment) After clearing my $HOME/.cache/sessions and logging out without saving, login time was reduced to 2 (!) seconds again. So there definitely is something wrong with the session saving.
Unfortunately you destroyed a useful bit of data that could help track this down -- the contents of your broken session file. If it happens again, please attach it.
5123 has more useful info... *** This bug has been marked as a duplicate of bug 5123 ***