When using an up to date Windows 7 image with everything at latest/greatest, I'm constantly seeing these type of messages in the console. Not noticing a performance hit but a lot of use can produce a ton of logging. 3/4/13 9:30:08.940 AM WindowServer[106]: _CGXGetWindowOrderingGroup: Operation on a window 0x315 requiring rights 0x5 by caller Internet Explorer 3/4/13 9:30:09.599 AM WindowServer[106]: _CGXGetWindowOrderingGroup: Operation on a window 0x83d requiring rights 0x5 by caller Windows 7 App 3/4/13 9:30:09.600 AM WindowServer[106]: _CGXGetWindowOrderingGroup: Operation on a window 0x315 requiring rights 0x5 by caller Internet Explorer 3/4/13 9:30:11.779 AM WindowServer[106]: _CGXGetWindowOrderingGroup: Operation on a window 0x315 requiring rights 0x5 by caller Bing Desktop Application