Page speed performance tools for WordPress.
https://wpmudev.com/project/wp-hummingbird/
Verified CDN
Get access to data on 103,150 websites that are Hummingbird Cache Customers. We know of 72,982 live websites using Hummingbird Cache and an additional 30,168 sites that used Hummingbird Cache historically and 31,269 websites in the United States.
Get a list of 103,150 websites using Hummingbird Cache which includes location information, hosting data, contact details, 72,982 currently live websites and an additional 72,599 domains that redirect to sites in this list. 30,168 sites that used this technology previouslyand 31,269 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.