Exanchorite and I played a game today. It seems he has a wireless connection. I used to have a wireless network, but because of it's unreliability for gaming I eventually just wired up my house.
The problem with wireless is that it gets jammed by pretty much everything. Wireless routers operate at 2.4 Ghz, as so phones, and microwaves leak some 2.4 as well. When this happens, you wireless connection starts to drop packets.
If you have to play on wireless, make sure you are close to your router as possible (mind you, if you are close enough, just run a wire). Make sure your wireless phones are off/unplugged, don't use the microwave, and if you have a CRT TV, keeping it off would be a good idea too.
If you're in an apartment, I'd suggest just moving your broadband connection closer to your computer or vice versa so you can run a wire, because all your neighbors are close and at least one of them is using a 2.4 Ghz phone.