React.js - return null vs display: none?

Question

React

Which is faster in performance for hiding an element, or ? return nulldisplay : none

Answer 1

I think it return nullwill make changes to the DOM, or to be more precise, it will remove the element, whereas setting a CSS property or adding a CSS class hidewith a CSS property display : nonewill hide the element faster because there is no need to change the DOM.
These are my guesses, and so I'll go look for proof / refutation of my guesses.