Less re-rendering

app/assets/javascripts/components/features/ui/containers/modal_container.jsx

@@ -3,6 +3,7 @@ import { closeModal } from '../../../actions/modal';
 import Lightbox from '../../../components/lightbox';
 import ImageLoader from 'react-imageloader';
 import LoadingIndicator from '../../../components/loading_indicator';
+import PureRenderMixin from 'react-addons-pure-render-mixin';
 
 const mapStateToProps = state => ({
   url: state.getIn(['modal', 'url']),
@@ -46,6 +47,8 @@ const Modal = React.createClass({
     onOverlayClicked: React.PropTypes.func
   },
 
+  mixins: [PureRenderMixin],
+
   render () {
     const { url, ...other } = this.props;