I've added a proxy to my current PiHole dns server. This one should be able to reduce greatly the RTT as it will cache the result given by PiHole and also is hosted on Google Cloud Platform.
Lists of public DNSCrypt-enabled resolvers.
Stable download URLs: https://download.dnscrypt.info/dnscrypt-resolvers/v2/
More DNS server sources: https://github.com/jedisct1/dnscrypt-proxy/wiki/DNS-server-sources
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