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 1,478,338 websites Boomerang Customers. We know of 679,536 live websites using Boomerang and an additional 798,802 sites that used Boomerang historically and 356,215 websites in the United States.
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Get a list of 1,478,338 websites using Boomerang which includes location information, hosting data, contact details, 679,536 currently live websites and an additional 728,287 domains that redirect to sites in this list. 798,802 sites that used this technology previouslyand 356,215 websites in the United States currently using Boomerang.
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