What causes skating feet in Unity (but not in mixamo or Autodesk FBX review)?

Question

I have uploaded a model to mixamo.com.
In mixamo, I've applied an animation, and in the mixamo preview window, the feet are perfectly stable, they don't skate at all.
I have downloaded the resulting fbx animation together with the skin, and I have opened it up in Autodesk FBX review.
In Autodesk FBX review, the feet are also perfectly stable.
I have then imported the fbx in Unity without changing anything.
In the animation preview window, the feet are skating.
Why is that so, and how do I get rid of it?

tmighty · Answer

I found out that the skating feet were caused by the option "Anim. Compression: Keyframe Reduction" in the Unity Animation tab.
Once I set Anim. Compression to "Off", the skating feet were gone.

What causes skating feet in Unity (but not in mixamo or Autodesk FBX review)?

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