WP Super Cache is a page cache generation tool for WordPress.
https://wordpress.org/extend/plugins/wp-super-cache/
Widgets · WordPress Plugins
Get access to data on 3,946,336 websites WP Super Cache Customers. We know of 776,532 live websites using WP Super Cache and an additional 3,169,804 sites that used WP Super Cache historically and 292,867 websites in the United States.
Get a list of 3,946,336 websites using WP Super Cache which includes location information, hosting data, contact details, 776,532 currently live websites and an additional 481,760 domains that redirect to sites in this list. 3,169,804 sites that used this technology previouslyand 292,867 websites in the United States currently using WP Super Cache.
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