Teramind Agent uses approximately 10 KB/s - 20 KB/s bandwidth depending on user activity level & number of screens. You can configure how much bandwidth is used and when from the settings.
You can also configure Teramind to run at a reduced frame-rate and color palettes, and that would cut back bandwidth and storage consumption significantly. For more information on how to reduce bandwidth and storage use, check out this article: How to reduce storage requirements?
Teramind is also detects if the connection is poor, and will dynamically reduce the frame rate accordingly to minimize bandwidth usage.