chaithu - 8:48 am on Dec 12, 2012 (gmt 0)
There are only two metrics to measure the performance of the site, one is alexa & another is Page rank by Google.
Alexa will give the rank to the site based on the number of times the user visited the site.
Alexa will resembles how your visitors behaves with your site.
It's will to identify the how popular your site is