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 1,804,307 websites mod_pagespeed Customers. We know of 328,129 live websites using mod_pagespeed and an additional 1,476,178 sites that used mod_pagespeed historically and 114,013 websites in the United States.
Get a list of 1,804,307 websites using mod_pagespeed which includes location information, hosting data, contact details, 328,129 currently live websites and an additional 233,133 domains that redirect to sites in this list. 1,476,178 sites that used this technology previouslyand 114,013 websites in the United States currently using mod_pagespeed.
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