we are running a terminal server with LTSP, Ubuntu 8.04 and Gnome. Due to users preferences, there is also Konqueror installed, and used frequently. All of them are using Open Office, Firefox and Thunderbird. Some of them additional applications like VMWare. Hardware is 2x Opteron 2 GHz with 4 GB Ram. There are 6 clients connected with 100 mbit.
Most of the time and for most users everything runs fine. But two of them complain pretty often about a slow system. One of them told me, that it sometimes takes up to 5 minutes, before a new email window in Thunderbird opens. How can I find out the reason for this?