I’m running Spring Boot on Google App Engine (Java) where I have a Task that calls an external API and upon receiving a response, it runs some code to processes the response. This external API can take 10-20 seconds to send back a response.

My question is, during that time my code is waiting for a response, are significant resources being consumed by my application and Google App Engine?

I assume that any data I have loaded into memory (such as the json data from the initial request to the Task or any Datastore entities I have loaded) is going to be taking up that memory in the instance for the 10-20 second. But what about the CPU or other resources? I am trying to understand how Google App Engine handles such situations efficiently.