Same with me - after 9-10 minutes in first night, first wave it starts lagging...Could you try running "resmon.exe" and find it out, what process or system resource cause this issue?
http://technet.microsoft.com/en-us/video/windows-7-screencast-resource-monitor-resmon.aspx
Last edited by Hpasp; 09/10/12 07:07 PM.