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 1,892,335 websites Boomerang Customers. We know of 1,106,880 live websites using Boomerang and an additional 785,455 sites that used Boomerang historically and 575,465 websites in the United States.
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Get a list of 1,892,335 websites using Boomerang which includes location information, hosting data, contact details, 1,106,880 currently live websites and an additional 1,082,397 domains that redirect to sites in this list. 785,455 sites that used this technology previouslyand 575,465 websites in the United States currently using Boomerang.
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