As performance optimization goes, I've never seen a system for building apps where you never need to worry about performance. Our goal with React is to give goo

As performance optimization goes, I've never seen a system for building apps where you never need to worry about performance. Our goal with React is to give good performance most of the time and to make it easy to optimize when you have problems -- in many cases, by adding a single shouldComponentUpdate. I think we generally succeed at this goal.