Which version of Google Analytics tracking code does this feature use?
Google has two tracking code versions in Google Analytics: Legacy Tracking Code (urchin.js) and New Tracking Code (ga.js).
You are strongly urged to use the New Tracking Code (ga.js).
You should do so in concert with using the asynchronous style of calling Google Analytics, which will greatly increase the speed with which Google Analytics is loaded.
Note: This is a Page Load Speed recommendation.
For more information, check out web analytic page.
Answered by: Paul Clemmer