Performance of onChange & event validation

[insin]

There is a performance cost to forcing a re-render of the form's containing component when something changes.

Figure out and document some guidelines for writing your own BoundField-rendering React component to implement shouldComponentUpdate().

Other things which will help in the short term:

• Providing a way to get all a field's mutable state from a BoundField
• Use React.addons.update() for state changes

Longer term:

• Use an immutable library for state objects.
• Switch to rendering React components for field rows & widgets