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By storing previous DNS query answers of name:ip mappings in a local cache, system responsiveness can be greatly enhanced. This link is a HowTo I've written on StackExchange which details how to configure "systemd-resolved" as a local DNS caching stub resolver on Raspbian:
Trust me: It's both easy- WITH THESE INSTRUCTIONS (without them, not so much ;-> ) - and worthwhile setting up a caching stub resolver:
raspberrypi.stackexchange.com: HowTo create a local IPv4/IPv6 DNS caching Stub Resolver