We are seeing some performance degradation using Mecanim instead of legacy animation for our core bipeds. A test scene with 500 characters (972 verts, 49 bones each) implied a performance loss of approximately 40% which was of course unexpected. The test environment had a character model rigged as "Humaniod" with the Avatar definition automatically created from the model (as shown in the video here: http://blogs.unity3d.com/2012/06/20/more-mecanim/). For the test, we just had one state with a run animation with no blending, and no environment geometry. For a varied number of characters in the scene, Mecanim's Humanoid performance was consistently lower than the Legacy animation system, as shown below: (All tests run in Unity 4.0.0f7 pro on Win 7 x64) Count - 200 300 400 500 Legacy FPS - 60 47 35 28 Mecanim FPS - 45 29 21 17 I don't think the animation system in 3.5 performed as well as the "legacy" option in 4.0 does, so there may already be some improvement over the older system. But in any case, are we missing any key steps that might improve the new animation system's performance? Any input would be appreciated. Thank you! -abm P.S. In terms of specific nomenclature, is "Mecanim" the new animation system in 4.0 regardless of whether you choose the Humanoid or Legacy animation type? In other words, is "Legacy" the 3.5 animation system, or legacy support within the new animation system?