pure heath
AnimatorLOD pro just released.
You can use it to automatically improve performance for animators.
This is done with a varying frameskip system, combined with runtime skin weight adjustment.
It can give up to a 40% performance improvement, without much loss of visual quality (as animators closeby animate at full framerate)
https://assetstore.unity.com/packages/tools/animation/animatorlod-pro-animator-optimizer-275807
