My machine is part of a large NIS domain with over 60,000 users. KDM actually handles all of those face icons surprisingly well. It only takes an extra 20 seconds or so to get the login window. However, I'd really like disable that feature.
I can disable it in the KDE Control Center, and I see the changes made to /usr/share/config/kdm/kdmrc. But somehow that feature keeps getting reenabled when I reboot. Perhaps there's a particular package I can uninstall? Until this is fixed, I'll just stick with runlevel 3 (this is actually the first time I've bothered with runlevel 5)
