My App's data usage is too high, how can I solve this?

I have a Meteor Cordova mobile app. When I tested it, I noticed that the app used 100mb of data in just 10 minutes of using it. I’m wondering if I can somehow test how much data does my app use, and how can i lower the data usage?

Meteor version 1.8.2
App uses pub/sub system

The Galaxy guide has some great tips here:

https://galaxy-guide.meteor.com/apm-reducing-pubsub-data-usage.html

https://galaxy-guide.meteor.com/apm-reduce-bandwidth-and-cpu-waste.html

https://galaxy-guide.meteor.com/apm-optimize-your-app-for-oplog.html

In addition to the suggestion above, you want to inspect the size of your DDP packets using Chrome Dev Tools for example. And then make sure to use field projections/pagination to eliminate any non required fields/data.