boomerang is a piece of javascript that you add to your web pages, where it measures the performance of your website from your end user's point of view.
http://yahoo.github.io/boomerang/doc/
JavaScript Libraries and Functions
Get access to data on 1,804,822 websites that are Boomerang Customers. We know of 29,756 live websites using Boomerang and an additional 1,775,066 sites that used Boomerang historically and 18,243 websites in the United States.
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Get a list of 1,804,822 websites using Boomerang which includes location information, hosting data, contact details, 29,756 currently live websites and an additional 255,058 domains that redirect to sites in this list. 1,775,066 sites that used this technology previouslyand 18,243 websites in the United States currently using Boomerang.
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