Page speed performance tools for WordPress.
https://wpmudev.com/project/wp-hummingbird/
Verified CDN
Get access to data on 104,756 websites that are Hummingbird Cache Customers. We know of 75,042 live websites using Hummingbird Cache and an additional 29,714 sites that used Hummingbird Cache historically and 32,081 websites in the United States.
Get a list of 104,756 websites using Hummingbird Cache which includes location information, hosting data, contact details, 75,042 currently live websites and an additional 75,963 domains that redirect to sites in this list. 29,714 sites that used this technology previouslyand 32,081 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.