the previous suggestion (making sure the actual host is resolvable in /etc/hosts) worked for this installation whereupon we have 4 machines on a Netgear LAN; the 4 hosts are localhost, localhost2, localhost3, etc., and KDE/Konqueror performance fell dramatically when the host names were changed to the above from the default "localhost". Editing the /etc/hosts file, wherein the hostnames all remained "localhost" to reflect the new names, resulted immediately (after restart) to the normally very fast performance.