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 1,829,663 websites that are Boomerang Customers. We know of 22,102 live websites using Boomerang and an additional 1,807,561 sites that used Boomerang historically and 12,876 websites in the United States.
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Get a list of 1,829,663 websites using Boomerang which includes location information, hosting data, contact details, 22,102 currently live websites and an additional 147,744 domains that redirect to sites in this list. 1,807,561 sites that used this technology previouslyand 12,876 websites in the United States currently using Boomerang.
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