Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.
The cookie is set by Google Analytics and is deleted when the user closes the browser. The cookie is not used by ga.js. The cookie is used to enable interoperability with urchin.js which is an older version of Google analytics and used in conjunction with the __utmb cookie to determine new sessions/visits.
The cookie is set by Google Analytics and is used to throttle request rate.
This cookie is set by Google analytics and is used to store the traffic source or campaign through which the visitor reached your site.