mod_pagespeed is an open-source Apache module that automatically optimizes web pages and resources on them.
https://developers.google.com/speed/pagespeed/mod
Operating Systems and Servers
Get access to data on 1,801,493 websites mod_pagespeed Customers. We know of 287,732 live websites using mod_pagespeed and an additional 1,513,761 sites that used mod_pagespeed historically and 99,954 websites in the United States.
Get a list of 1,801,493 websites using mod_pagespeed which includes location information, hosting data, contact details, 287,732 currently live websites and an additional 200,062 domains that redirect to sites in this list. 1,513,761 sites that used this technology previouslyand 99,954 websites in the United States currently using mod_pagespeed.
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