It might be a bit of stretch, something you could consider doing is change the channel that you Wifi is broadcasting at. If you live in an area where there are a lot of wireless networks, the channel that your router is broadcasting at could be congested. The program is easy to use, the difficult part if any, would be changing the channel in your wireless network settings. If you feel adventurous, this could be doable.
http://www.techspot.com/downloads/5936-inssider.html
The above link is to download the software if you are interested. This may or may not help.