Intent automatically tracks changes in the model through the render process.
Enable or disable automatic updates to Intent models
The green-light state propagates all modifications to Inventor.
The red-light state is useful when you make multiple changes that each take time to render.
After the bulk changes are completed, switch automatic updates back to green to render the model with all of the changes.
If the Render operation takes a significant amount of time, the current progress shows in the Inventor status bar:
Intent does not pre-calculate the steps count, so the percentage can decrease as the model renders.
Set the EnableProgress Indicator

Control visibilty of the progress indicator
IntentAPI.Instance.Options.IsRenderProgressEnabled
Create a custom progress indicator
The simplest implementation looks like this:
class NullProgressIndicator : ProgressIndicator
{
public NullProgressIndicator() : base() {}
public override void OnStart() {}
public override void OnProgress(long curValue, long maxValue) {}
public override void OnEnd() {}
}Create an instance of your class after the Intent API is initialized (check Autodesk.Intent.IntentAPI.Initialized).