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 1,771,167 websites that are mod_pagespeed Customers. We know of 216,848 live websites using mod_pagespeed and an additional 1,554,319 sites that used mod_pagespeed historically and 73,641 websites in the United States.
Get a list of 1,771,167 websites using mod_pagespeed which includes location information, hosting data, contact details, 216,848 currently live websites and an additional 184,293 domains that redirect to sites in this list. 1,554,319 sites that used this technology previouslyand 73,641 websites in the United States currently using mod_pagespeed.
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