This release of Ubuntu works out of the box or at least should work. I just upgraded from my previous installation and it seems to work just fine.
If you used my previous instructions to install Ubuntu 12.04, you need remove few files before upgrading to 12.10. First one to delete is /etc/apt/preferences.d/quantal-kernel and second one is /etc/apt/sources.list.d/quantal.list. After this you can just run update manager to upgrade to 12.10.
By default gnome-shell and unity use software 3d rendering pipeline that is fairly slow. So you need to use some desktop environment that is more light weight and does not require 3d acceleration. For example: classic gnome without effects.