Stormpath has historically been able to process requests in 70ms or less. Network overhead for the round-trip request will determine the rest of the total response time. As network speeds will vary based on connection and proximity to Stormpath servers, we recommend signing up for a free Stormpath developer account and connecting to the API for the most accurate estimates.
For reference, Stormpath's community API (api.stormpath.com) and Enterprise API is currently hosted on multiple zones in AWS East.
Private Deployment environments are deployed in the preferred region, typically nearest to their headquarters.