refactor(elements): render only visible elements

example/src/index.tsx

@@ -5,6 +5,7 @@ import { BrowserRouter as Router, Route, Switch, withRouter } from 'react-router
 import Basic from './Basic';
 import UpdateNode from './UpdateNode';
 import Stress from './Stress';
+import CustomNode from './CustomNode';
 
 import './index.css';
 
@@ -21,6 +22,10 @@ const routes = [
     path: '/stress',
     component: Stress,
   },
+  {
+    path: '/custom-node',
+    component: CustomNode,
+  },
 ];
 
 const Header = withRouter(({ history, location }) => {