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 1,878,076 websites that are Boomerang Customers. We know of 21,681 live websites using Boomerang and an additional 1,856,395 sites that used Boomerang historically and 12,915 websites in the United States.
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Get a list of 1,878,076 websites using Boomerang which includes location information, hosting data, contact details, 21,681 currently live websites and an additional 148,753 domains that redirect to sites in this list. 1,856,395 sites that used this technology previouslyand 12,915 websites in the United States currently using Boomerang.
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