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 916,652 websites that are Boomerang Customers. We know of 233,363 live websites using Boomerang and an additional 683,289 sites that used Boomerang historically and 136,296 websites in the United States.
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Get a list of 916,652 websites using Boomerang which includes location information, hosting data, contact details, 233,363 currently live websites and an additional 311,721 domains that redirect to sites in this list. 683,289 sites that used this technology previously and 136,296 websites in the United States currently using Boomerang.
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