The Profiler in Unity 2017.2.0b6 shows a significant cost for "Physics2D", even when no Physics2D features are used. This issue occurs in a build and editor. This issue does not seem to exist in Unity 2017.1.0p1. I noticed this in my actual project, where I don't use any Physics2D features, but Physics2D often peaked to more than 2ms in the Profiler. I was able to reproduce this issue in a simple project by just rotating a few Rigidbodies. Spoiler: Video Reproduce Open user project Open Assets/Scene.unity Open Window/Profiler Enter "Physics2D" in Profiler search field Press Play Observe Physics2D comes with a significant cost. The provided example spends about 1ms in Physics2D. The cost is directly related to the number of Rigidbodies. Expected Physics2D costs 0 ms, if no Physics2D features are used.