better performance

src/containers/ContainerWrapper.js

     return class extends Component {
       constructor(props) {
         super(props);
+        this._saveContainerRef = this._saveContainerRef.bind(this);
         this._assertId(props);
         this._createState(props);
       }
         };
       }
 
+      _saveContainerRef(r) {
+        this.originalContainerRef = r;
+      }
+
       componentWillMount() {
         store.setRefForId(this.state.id, this);
       }
       render() {
         return (
           <OriginalContainer
-            ref={(r) => this.originalContainerRef = r}
+            ref={this._saveContainerRef}
             {...this.state.allProps}
             id={this.state.id}
             key={this.state.id}