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 1,350,893 websites that are Boomerang Customers. We know of 685,654 live websites using Boomerang and an additional 665,239 sites that used Boomerang historically and 365,924 websites in the United States.
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Get a list of 1,350,893 websites using Boomerang which includes location information, hosting data, contact details, 685,654 currently live websites and an additional 741,080 domains that redirect to sites in this list. 665,239 sites that used this technology previously and 365,924 websites in the United States currently using Boomerang.
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