The GUI is 1 or 2% slower than the CLI due to overhead of the graphical interface. For starting out, the GUI is fine; on the other hand, I'd recommend the CLI if you have a Windows NT, 2000, or XP system which is used in a multi-user fashion (so it's sitting at the login screen for a sizeable amount of time). Then you can run the CLI as a "service" which means that it will run regardless of whether someone's logged in or not, and it will be invisible (harder for the kids - or parents, or other relation, depending on your situation - to shut down). Installing the CLI as a service requires administrator privileges, and also since it is invisible, we generally recommend a program called F@H LogStats (linked in the other thread, IIRC) so you can keep an eye on that client, as well as any others you have on the same LAN. I'm quite willing to provide more details if you'd like to know. 🙂