Improving React Server Side Rendering

Tips from Reactjs - Speed up Server Side Rendering - Sasha Aickin

Production mode

 node_env = 'production'

Setting up production mode reduces error checking ReactJS performs in development mode

Minified react version


import ReactDOMserver from "react-dom/server"



It will make server harder to debug that is why you shouldn't be doing it in development.

Babel transforms

npm install --save-dev \
 babel-plugin-transform-react-constant-elements \

Add them to babel config file.

"presets": [ /** **/ ]
"plugins": [


  1. constant plugin should be added as the first one.
  2. Requires babel build step

Avoid React.createClass()

Replace all instances of React.createClass(), eg:

var MyCustomClass = React.createClass({
  render: function {
    return <div>Hello world</div>


class MyCustomClass extends React.Component {
  render() {
    return <div>Hello world</div>


  1. Refactoring code requires a bit more time.
  2. It introduces few gotchas that might generate bugs, for example auto bound handlers.


Chunked Encoding available from HTTP/1.1 (1999) allows to serve partial HTML to the browser. There is a aickin/react-dom-stream - a streaming server-side rendering library for React. It allows to replace ReactDOM.renderToString with ReactDOMStream.renderToString and use ReactDOMStream.renderToStaticMarkup alongside to provide readable streams as children in the React element tree the same way that it accepts Strings as children in the tree.

Check out Sasha's project for more details, including component caching feature.

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