• Take a llok at this article by Brent Ozar. It will answer most/all of your questions.

    http://www.brentozar.com/archive/2013/08/what-is-the-cxpacket-wait-type-and-how-do-you-reduce-it/

    ** Don't mistake the ‘stupidity of the crowd’ for the ‘wisdom of the group’! **