Page speed performance tools for WordPress.
https://wpmudev.com/project/wp-hummingbird/
Verified CDN
Get access to data on 106,665 websites that are Hummingbird Cache Customers. We know of 77,385 live websites using Hummingbird Cache and an additional 29,280 sites that used Hummingbird Cache historically and 33,169 websites in the United States.
Get a list of 106,665 websites using Hummingbird Cache which includes location information, hosting data, contact details, 77,385 currently live websites and an additional 78,619 domains that redirect to sites in this list. 29,280 sites that used this technology previouslyand 33,169 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.