update, Friday evening now and my RTT to EWR is now 8.5ms (4.2 each way), up from 6 point something this morning.

From Philadelphia suburbs to my actual Fly app in:

EWR 8.5ms (NYC)

SJC 75ms (California)

CDG 86ms (France, cross atlantic)

GRU 126.2 (Brazil)

HKG 225.3 (Hong Kong)

Now try from Idaho or Botswana