WiFi is nice but many gamers seem to repeat this lesson. Get wired and see if it fixes it. I don't expect any "network utilization" to be the cause or cure when the WiFi is is in use.
I play an online game (World of Tanks to be specific). On occasion I am subject to crippling lag. While this is to be expected in MMOs from time to time, I always seem to be victim to it when no one else on the server is experiencing the problem. After some investigation, I noticed it's when I'm in a part of my house where the wireless signal isn't perfect. However how can this cause a problem? My cable internet has a max speed of 12Mbs per second and even at the lowest connection speed, I'm connected to the wireless network at 72Mbs per second. And when I look at my network utilization, I'm at a meager 10%. Is there a setting somewhere for individual applications that limits the portion of network bandwidth the application can use? Can there be another explanation?