Just a switch for React.addons.perf
<script src="//npmcdn.com/react/dist/react-with-addons.min.js"></script>
<script src="//npmcdn.com/react-perf-switch/dist/perfswitch.js"></script>
<script src="//npmcdn.com/react/dist/react-with-addons.min.js"></script>
<script src="//npmcdn.com/react-perf-switch/dist/perfswitch.js"></script>