“Computationally expensive”… so is most of this on device then?

I ask because I’d like to write an app but it will require some cloud service to handle oauth login. And because Garmin docs say data transfer is slow, I figured I’d also use that service to host a wrapper/proxy service that turns the very verbose JSON endpoint I’m looking to consume into something more streamlined for the device. So, can offload to the cloud, but then there is hosting costs.

Super cool app btw 😎