DelayRender.js

class DelayRender extends React.Component {
  
  constructor({onPropsChange, ...props}) {
    super(...arguments)
    this.state = {props}
  }

  componentWillReceiveProps(props) { 
    this.setState({isWaiting: true})
    this.props.onPropsChange(() => {this.setState({props, isWaiting: false})})
  },

  shouldComponentUpdate(newProps, newState) { return this.state !== newState; },

  render() { 
    return React.cloneElement(
      React.Children.only(this.props.children), 
      {...this.state.props, isWaiting: this.state.isWaiting}
    )
  }
}