Whole component is always re-rendered

I have animation at top "main" component. I found out that when I change property of a component that is nested inside "main", the whole "main" component is re-rendered. Besides performance, this causes problems when there is a text input field which loses focus after re-render.
Also it is strange that I had to add componentShouldUpdate to make animations work. It enables animations even when componentShouldUpdate always return true.

This can be reproduced only by adding tweenstate.Mixin without any animations enabled.
I use Om (Clojurescript), ReactJS 13.3 and react-tween-state from master.

BTW, would you recommend using chenglou/react-motion instead?

Start by reproducing the issue with Om, ReactJS 13.3, and tweenstate.Mixin without animations enabled, then compare behavior when the mixin is removed. Done means nested component changes no longer re-render the whole main component and text inputs retain focus.

Written by the indexing model from the issue text.