Login process slow

After I install the Ubuntu 7.1 I find the login process is a bit slower than Ubuntu 7.04. It will take around one minute before the desktop icons and panels appear. In Ubuntu 7.04, on my machine the login process is usually less than 10 seconds.

In addition .xsession-errors report several problems:
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(process:5337): Gtk-WARNING **: This process is currently running setuid or setgid.
This is not a supported use of GTK+. You must create a helper
program instead. For further details, see:

    http://www.gtk.org/setuid.html

Refusing to initialize GTK+.

(process:5341): Gtk-WARNING **: This process is currently running setuid or setgid.
This is not a supported use of GTK+. You must create a helper
program instead. For further details, see:

    http://www.gtk.org/setuid.html

Refusing to initialize GTK+.
/etc/gdm/Xsession: Beginning session setup...
/etc/X11/Xsession.d/40guidance-displayconfig_restore: 11: /usr/bin/displayconfig-restore: not found
Setting IM through im-switch for locale=en_SG.
Start IM through /etc/X11/xinit/xinput.d/en_SG linked to /etc/X11/xinit/xinput.d/scim.
Smart Common Input Method 1.4.7

Launching a SCIM daemon with Socket FrontEnd...
Loading simple Config module ...
Creating backend ...
Loading socket FrontEnd module ...
Starting SCIM as daemon ...
Launching a SCIM process with x11...
Loading socket Config module ...
SESSION_MANAGER=local/leo-laptop:/tmp/.ICE-unix/5334
Creating backend ...
Loading x11 FrontEnd module ...
GTK Panel of SCIM 1.4.7

Starting SCIM as daemon ...
SCIM has been successfully launched.
Checking for Xgl: not present.
Detected PCI ID for VGA: 00:02.0 0300: 8086:2592 (rev 03) (prog-if 00 [VGA])
Checking for texture_from_pixmap: not present.
Trying again with indirect rendering:
Checking for texture_from_pixmap: present.
Checking for non power of two support: present.
Checking for Composite extension: present.
Comparing resolution (1280x800) to maximum 3D texture size (2048): Passed.
Checking for nVidia: not present.
Checking for FBConfig: present.
Checking for Xgl: not present.
Starting emerald
** Message: Not starting remote desktop server

Tracker version 0.6.3 Copyright (c) 2005-2007 by Jamie McCracken (<email address hidden>)

This program is free software and comes without any warranty.
It is licensed under version 2 or later of the General Public License which can be viewed at http://www.gnu.org/licenses/gpl.txt

Initialising tracker...
Could not set idle IO priority...attempting best effort 7 priority
Throttle level is 0
Initializing gnome-mount extension
/usr/bin/compiz.real (video) - Warn: No 8 bit GLX pixmap format, disabling YV12 image format

(gnome-panel:5394): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width -15 and height 24

** (update-notifier:5523): WARNING **: no cdrom: disk
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