Measure performance using SPMonitoredScope

http://msdn.microsoft.com/en-us/library/ff512758%28v=office.14%29.aspx
http://zimmergren.net/technical/sp-2010-developing-for-performance-part-2-spmonitoredscope
http://stackoverflow.com/questions/8276723/sharepoint-2010-spmonitoredscope-performance-implication
http://www.wictorwilen.se/sharepoint-2013-what%E2%80%99s-new-with-the-spmonitoredscope
http://blogs.technet.com/b/speschka/archive/2009/10/28/using-the-developer-dashboard-in-sharepoint-2010.aspx
http://www.rightpoint.com/community/blogs/viewpoint/archive/2011/10/03/using-the-sharepoint-developer-dashboard-and-spmonitoredscope.aspx
http://blogs.technet.com/b/speschka/archive/2009/10/28/using-the-developer-dashboard-in-sharepoint-2010.aspx