Depending on how your network is set up, especially if it is P2P, it could be that your computer is going directly to LMI's servers and back down to your server. This would bypass your direct connection to the server over your wireless. If your wireless connection is slower than your connection over your ISP, then that could explain it.
Take one computer and connect with Cat5e or Cat6 to your switch or directly to the computer (you may need a crossover cable). I would think this would be much faster. You can check the speed in Amazing Tools or whatever it is called.
