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 1,784,352 websites that are mod_pagespeed Customers. We know of 299,416 live websites using mod_pagespeed and an additional 1,484,936 sites that used mod_pagespeed historically and 97,537 websites in the United States.
Get a list of 1,784,352 websites using mod_pagespeed which includes location information, hosting data, contact details, 299,416 currently live websites and an additional 198,959 domains that redirect to sites in this list. 1,484,936 sites that used this technology previouslyand 97,537 websites in the United States currently using mod_pagespeed.
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