In order to maintain interactivity and guarantee a user-defined frame rate, JetStream only renders what it can in the fraction of a second it has. The remainder is "dropped out", or not rendered. However, JetStream prioritizes what is rendered and what is dropped out based on size of the item's bounding box, distance from viewer and size on screen, so only the less significant items in the scene are dropped out. Once navigation has ceased, the scene continues rendering until all items are visible.