ac-billboard props input accepts a JSON which can have all properties found in Cesium Entity (like position) plus all properties found in Cesium BillboardGraphics.height: 0 or any other value in the props.undefined which leads Cesium to use GroundPrimitive which is less efficient. As a result, if you want your entity to be more efficient, set height: 0 or any other value in the props.ac-entity-desc vs ac-entityac-entity-desc components are used to describe how each entity / array of entities in a stream of entities, managed inside ac-layer, should be drawn.ac-entity-primitive-desc component is the same as ac-entity-desc with the difference of using Primitives to render the graphics. It is more efficient than ac-entity-desc when drawing an updating entity.ac-entity component is used to draw an entity directly on the map, and so, can be used directly under ac-map.