Comment by farrokhi

The response time depends on network peering from their anycast locations. I am seeing different response times based on test locations.

From US:

  # ./dnseval.py -f google-vs-quad9.txt -c 50 -C yahoo.com
  server      avg(ms)     min(ms)     max(ms)     stddev(ms)  lost(%)  ttl        flags
  ----------------------------------------------------------------------------------------------------
  8.8.8.8     31.857      31.278      33.416      0.434       %0       1332       QR -- -- RD RA -- --
  8.8.4.4     31.865      31.361      32.872      0.336       %0       1330       QR -- -- RD RA -- --
  9.9.9.9     93.703      92.797      95.362      0.586       %0       1391       QR -- -- RD RA -- --

From Iran:

  # ./dnseval.py -f google-vs-quad9.txt -c 50 -C yahoo.com
  server      avg(ms)     min(ms)     max(ms)     stddev(ms)  lost(%)  ttl        flags
  ----------------------------------------------------------------------------------------------------
  8.8.8.8     105.093     90.046      130.871     9.749       %0       3590       QR -- -- RD RA -- --
  8.8.4.4     99.458      84.472      133.375     11.308      %0       3585       QR -- -- RD RA -- --
  9.9.9.9     96.231      83.957      134.709     9.503       %0       3595       QR -- -- RD RA -- --

Tests are performed using dnsdiag tools: https://github.com/farrokhi/dnsdiag