Page speed performance tools for WordPress.
https://wpmudev.com/project/wp-hummingbird/
Verified CDN
Get access to data on 101,779 websites that are Hummingbird Cache Customers. We know of 74,082 live websites using Hummingbird Cache and an additional 27,697 sites that used Hummingbird Cache historically and 31,832 websites in the United States.
Get a list of 101,779 websites using Hummingbird Cache which includes location information, hosting data, contact details, 74,082 currently live websites and an additional 75,105 domains that redirect to sites in this list. 27,697 sites that used this technology previouslyand 31,832 websites in the United States currently using Hummingbird Cache.
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These are sites that we think might use Hummingbird Cache in the future because of their similarity to other sites that already do.