Just wondering if you are using AWS or something else?
No AWS here 
We run all our own servers in multiple datacenters all over the world.
Is the Fly API served via Heroku? I recall seeing Via: Vegur in the response headers.
It used to be, it’s now just a Fly app! We’re making it multi region in the next few months, too: How do you improve DB performance in countries across the world - #2 by kurt