Mute Dynamics

There is a "muteDynamic" attribute on each agent. Once we turn this on, the agent will never enable dynamics and will not join the collision detection, the pre-build RBD object will never been created. In some cases, using this feature properly, it will save tremendously amount of memory for you as well as speed your simulation up. See some real example in Part 9 Optimizing.
Additionally, this attribute cannot save with scene, if the agents have been deleted and placed out again, these attribute will change back. So, you need enable "muteDynamics" first and use "inverse placement" to store these data to a new place node.