Comment by freediver

I did test 1.1.1.1 and found it to be pretty slow on long tail domains (obviously everyone is caching popular ones).

I bascially ran a 'dig' with multiple DNS providers and CloudFlare was slowest among the bunch for long-tail domains.

Here are the details: https://twitter.com/vladquant/status/1428761979808669704

CloudFlare never responded to this tweet.