Hi all. What I really want to know is the following: in Unity 5, is it less expensive to have moving static colliders or moving Kinematic Rigidbodies? However, the documentation on that is somewhat dubious. When the new features of Unity 5 was being announced, it was claimed that it would bring the following gift: "Moving Static Colliders will be a lot less expensive" (see http://blogs.unity3d.com/2014/07/08/high-performance-physics-in-unity-5/). Later, when it was released, we were told something even happier: "moving static colliders does not cause performance penalty anymore" (see http://unity3d.com/unity/whats-new/unity-5.0). However, these two claims are not the same. One makes the reader think that the penalty would be diminished. The other makes the reader think that the penalty is all gone. That's an important difference because having a moving static collider could have become much less expensive but be still worse than having a moving kinematic rigidbody. So, which is true? If the penalty is all gone, then the answer to my main question is simple: in case one does not need any of Rigidbody goodies, then having a moving static collider is better since it is as simple as one can gets. If the penalty was diminished but not gone, then things are more complicated and I would love to hear more about that. Thanks a lot for your time.