Hastening React SSR - Web Performance San Diego

HASTENING REACT SSR WITH
COMPONENT MEMOIZATION
AND TEMPLATIZATION

Increasing User Demand
www.radware.com
Web App Performance

•For every 1 second of
improvement, experienced up to
a 2% increase in conversions
•For every 100 ms of
improvement, grew incremental
revenue by up to 1%
Time is Money
Source: http://www.globaldots.com/how-website-speed-affects-conversion-rates

Server-Side Rendering (SSR)
•Better user experience of
the initial page load 
•Better search engine ranking

Server-Side React
Bad User Experience!

Server-Side React
CPU proﬁle for one request
On large pages, renderToString(.) blocks
nodeJS’s event-loop and starves out
incoming requests to the server.

Server-Side React
• Facebook: “Funny story about Server
Rendering - it wasn’t actually
designed that way.” (Sebastian
Markbåge)
• Facebook: “we don’t use it that
heavily, which is why we haven’t really
invested strongly in it.” (Sebastian
Markbåge)
React.js Conf 2015  
Q&A with the team
https://youtu.be/EPpkboSKvPI?t=7m48s

Server-Side React
0
325ms
650ms
975ms
1s 300ms
React React (best practices) mustache
https://github.com/ndreckshage/react-boston-ssr

• Looked at react-dom-stream and
redﬁn/react-server to improve TTFB
and ATF improvement
• Challenges
• Forks react and introduces new
interfaces, i.e. not “React at heart”
• Doesn't solve CPU total time
Server-Side React
ReactJS SF meetup in January 2016
https://github.com/aickin/react-dom-stream

React Rendering Lifecycle
getDefaultProps()
getInitialState()
componentWillMount()
render()
componentDidMount()
Create Component
Instance
Create Transaction
Mount Component
(Gen Markup)
Transaction.enqueue
componentInstance
Transaction.dequeue

Mount ComponentReact EL with Props Markup
Given a set of properties, the markup generated is always the same
Component Cache
Double Clicking into Mount Component

Memoizing Components
The same “text” prop will always return
the same helloworld html string
class HelloWorldComponent extends React.Component {
render() {
return <div>Hello {this.props.text}!</div>;
}
}
When text is “World” the output is:
<div>Hello World!</div>

Memoizing Components
The same “text” prop will always return
the same helloworld html string
class HelloWorldComponent extends React.Component {
render() {
return <div>Hello {this.props.text}!</div>;
}
}
When text is “World” the output is:
<div>Hello World!</div>
var componentOptimization =
require("electrode-react-ssr-
optimization");
var componentOptimizationRef =
componentOptimization({
components: {
'HelloWorldComponent': { 
keyAttrs: ["text"]
}
}
});

Templatizing Componentsvar React = require('react');
var ProductView = React.createClass({
render: function() {
return (
<div className="product">
<img src={this.props.product.image}/>
<div className="product-detail">
<p className="name">{this.props.product.name}</p>
<p className="description">{this.props.product.description}
</p> <p className="price">Price: ${this.props.product.price}</p>
<button type="button" onClick={this.addToCart}
disabled={this.props.inventory > 0 ? '' : 'disabled'}> Add To Cart
</button>
</div>
</div>
);
}
});
module.exports = ProductView;

return (
</button>
</div>
</div>
);
}
});
• Dynamic props that would be
different for each product. 
• Switch the corresponding props
with template delimiters  
(i.e. ${ prop_name }) during react
component rendering cycle.
• The template is then compiled,
cached, executed and the
markup is handed back to React.

Templatizing Components
• Dynamic props that would be
different for each product. 
• Switch the corresponding props
with template delimiters  
(i.e. ${ prop_name }) during react
component rendering cycle.
• The template is then compiled,
cached, executed and the
markup is handed back to React.
<img src=${product_image}/>
<p className="name">${product_name}</p>
<p className="description">${product_description}</p>
<p className="price">Price: ${selected_price}</p>
<button type="button" onClick={this.addToCart}>
Add To Cart
</button>
</div>
</div>

return (
</button>
</div>
</div>
);
}
});
optimization");
components: {
"ProductView": {
templateAttrs: ["product.image", 
"product.name",  
"product.description",  
"product.price"]
},
}
});

return (
disabled={this.props.inventory > 0 ? '' : 'disabled'}> {this.props.inventory ? 'Add To Cart' : 'Sold Out'}
</button>
</div>
</div>
);
}
});

optimization");
components: {
"ProductView": {
templateAttrs: ["product.image", 
"product.name",  
"product.description",  
“product.price”],
keyAttrs: ["product.inventory"]
},
}
});
var React = require('react');
return (
disabled={this.props.inventory > 0 ? '' : 'disabled'}> {this.props.inventory ? 'Add To Cart' : 'Sold Out'}
</button>
</div>
</div>
);
}
});

Add To Cart
</button>
</div>
</div>
Sold Out
</button>
</div>
</div>
Cached Template 1 - Sold Out Cached Template 2 - Add To Cart

green blocks indicating markup that was cached on the server

Server-Side React
CPU proﬁle for one request
with rendering optimization

Thank You
https://github.com/walmartlabs/electrode-react-ssr-optimization

Hastening React SSR - Web Performance San Diego

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