Animators are disabled when an avatar is outside of your view, but IsAnimatorEnabled will stay true when it shouldn't. Distance-based culling works as intended, but frustum culling does not.

Video of me reproducing it (it was too big to upload here directly): https://www.youtube.com/watch?v=WwbYiJ5WUuA

Avatar: https://vrchat.com/home/avatar/avtr_30326456-9baf-466a-8843-70b1480e40c8