Perspective data - bandwidth usage?

We are beginning to develop with Perspective for mobile app usage, and we have a very simple data entry form right now. My concern is the amount of data usage I’m seeing. It seems to mostly come from the initial project load and when refreshed, it uses 1.2 Mb each time. The data entry does some queries, but I’m assuming it’s sending a simple signal to the gateway and just uses minimal bandwidth from that. Anyways, the 1.2 Mb seems to add up quick, and would fill up our 2,000 Mb per user plan in a short amount of time. Our users are remote in the field and go to many locations throughout the day.
Is this normal, anything I can do to adjust this?