After playing the game and suffering from trouble lag for 800+ hours, my fellow =KZO= clan mate & friend Matt and I came up with the following fix that worked great for me and may do the same for you.
Video of game play before fix:http://www.youtube.com/watch?v=gpobzRkEDUU
Use the link below to open the following ports in your Windows Firewall.
33000 - 34000 TCP & UDPhttp://windows.microsoft.com/en-us/windows7/open-a-port-in-windows-firewall
Use the link below to open the same ports in your Router.http://portforward.com/
After you have opened the required ports in your Windows Firewall and in your
Router, download and install this free and easy to use port checker tool:http://portforward.com/help/portcheck.htm
Using the port checker tool, verify that 33000 - 34000 TCP & UDP ports are open.
Launch the game.
After the game launch, use the Windows key to exit the game.
Access the Windows Task Manager by pressing Ctrl, Alt & Delete.
From the windows Task Manager screen on the Processes Tab, right click on:
Infestation process and select set priority and set priority to High and click the
Change priority box.
Right click on the Steam process and select set priority and set priority to Low
and click the Change priority box.
Right click on the PnkBstrB process and select set priority and set priority to High and click the Change priority box.
Left click on the previously opened game icon located on your task bar to reenter the game.
You may need to set the game priority to High each time you start the game.
After accomplishing the above, my game now run's better then its ever before!
Video of game play after fix:http://www.youtube.com/watch?v=YiHZNbK6BRw&feature=youtu.be
Windows 7 Home Premium
Service Pack 1
AMD FX 8150 Eight-Core Processor 3.60 Ghz
8 GB RAM
64-bit Operating System
NVIDIA GeForce GTX 560 2 GB of RAM Overclocked
My internet speet test results:http://www.speedtest.net/my-result/2820448501
=KZO= Want's You!http://steamcommunity.com/groups/noobserverhost