As a person responsible for operating various DNS services, performance has always been an area of interest for me. One performance metric on which we all focus is: How fast is my service? Let me be more specific here, by “fast” we mean that when a DNS query is made, an answer is provided quickly to a DNS client. We call this query resolution time. We are going to be running several tests in upcoming months that focus on DNS performance. This first analysis is about the performance of DNS root servers.