Server calls are expensive. Optimizing the number of calls and the frequency of those calls often provides good performance returns. Not only does a service call require client resources, it also calls the server. Excessive refreshing of datasets can cripple the usability of an application. Let's explore how the application will use services and how we can optimize that usage.
Developers who haven't been watching the Network tab in Developer Tools can be astonished by the sheer volume of server calls their application is making. Requiring many service calls to initialize the application can significantly increase the duration it takes the application to be ready for the user. Optimizing the use of service calls is one of the other significant performance knobs developers have at their disposal.
As the application starts to come together, make a point to inventory the JSON network calls. Can you account for each and every one? Yes, I said every one...