Decreasing DPC Latency could help, particularly if you have the Atheros Wireless Network Adapter and are using the camera for wireless video conferencing, such as Skype. See
http://rog.asus.com/forum/showthread.php?5126-Any-Kind-of-Lag-and-Atheros-WiFi-CardThe OP of the "Drivers, Apps, and How-to's thread has a link to the most recent Atheros driver version 9.2.1.470.
If you really want wireless performance, you should consider an upgrade to the Intel 6300 WiFi card and use the 5 Ghz band.
Be sure to check out the DPC Latency Checker. There could be other drivers causing latency on your laptop.
G74SX-A1 - stock hardware - BIOS 202 - 2nd Monitor VISIO VF551XVT