Periodically re-querying most used domain names

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Closed as a duplicate of:

Prefetch Popular Domains to Improve Cached Response Frequency

tl;dr: prefetching could help increase Pi-hole cache utilization, and improve overall network speed at the cost of increased outbound DNS queries Prefetching is a common DNS practice designed to increase cached response rate for DNS servers, as cached responses are typically faster than forwarded responses - especially for users who utilize a recursive DNS resolver like Unbound. For the uninitiated, prefetching is the act of preemptively querying domains prior to their TTL expiring. Functiona…