Quick Cache provides page caching for WordPress.
http://wordpress.org/plugins/quick-cache/
Widgets · WordPress Plugins
Get access to data on 86,940 websites that are Quick Cache Customers. We know of 6,134 live websites using Quick Cache and an additional 80,806 sites that used Quick Cache historically and 3,320 websites in the United States.
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Get a list of 86,940 websites using Quick Cache which includes location information, hosting data, contact details, 6,134 currently live websites and an additional 2,080 domains that redirect to sites in this list. 80,806 sites that used this technology previously and 3,320 websites in the United States currently using Quick Cache.