So for now, it performs side-by-side benchmarking of DNS nameservers addressed using either IPv4 or IPv6.
During the work on this, I decided to add a new sorting/ranking system using the RMS value (root mean square) of the Benchmark's three performance metrics (cached, uncached & dot com) rather than the straight three-level sort that has always been used. That new sort will be implemented next while the bugs and things I missed in R3 are found.
Once those are fixed I plan to start on the implementation of the three TLS-style secure DNS queries: DoH, DoT & DoQ.
During this re-engineering work I also realized how I could dramatically improve the performance of the benchmarking and custom resolver list building. So that will be a future feature as well.