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 1,899,169 websites that are Boomerang Customers. We know of 19,685 live websites using Boomerang and an additional 1,879,484 sites that used Boomerang historically and 11,567 websites in the United States.
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Get a list of 1,899,169 websites using Boomerang which includes location information, hosting data, contact details, 19,685 currently live websites and an additional 150,367 domains that redirect to sites in this list. 1,879,484 sites that used this technology previouslyand 11,567 websites in the United States currently using Boomerang.
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