The mitkBaseRenderer listens so several events:

• using ConnectGeometrySliceEvent and ConnectGeometryUpdateEvent the base renderer reacts on the slice navigation controller
  • this results in either BaseRenderer::SetGeometrySlice or BaseRenderer::UpdateGeometry being called

There seems to be some unnecessary updates inside these two functions so this task should take care of refactoring the different update-functions.

The mitkBaseRenderer does not react on the GeometrySendEvent of the slice navigation controller.
The corresponding function would be SetGeometry, which needs to be inspected as well.
Edit: The GeometrySendEvent of the SliceNavigationController is connected via ConnectGeometrySliceEvent with a default parameter set to true.