When GM'ing, be very animated and enthusiastic. There is nothing worse than a GM who sits behind his screens and talks to you over them. The more excitement you build up in the players, the more inclined they are to move quickly through the module. Again, it help move things along and prevents them from getting hung up in any one spot in the module. Choose mid-day time slots.
Players are half-awake in the morning, and fading out at night.
Shoot for something in the late afternoon, or early evening. Makes for much more animated play. Hope that helps. If you have any more advice for the con-goer, drop me a note I will add it to this page. Questions and comments are most welcome.