ReactFoo 2017

A conference on React

Improving Load time of a Production React App

Submitted by Kanav Arora (@kanavarora) on Wednesday, 2 August 2017


Technical level



Full Talk


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The talk will draw on our learnings from the efforts that we undertook earlier this year to improve UrbanClaps’s website performance, resulting in a 60% reduction in load time. All our efforts towards performance engineering can be bucketed in roughly two areas: ship less assets and tweaking order of delivery of assets. In this talk I will primarily focus on the former with key emphasis on how to really optimize bundling via webpack. All of this was done in the context of a large production app with constraints on product, business and user experience.


- Tech stack of the urbanclap front end website
- Complexities faced in improving performance - Performance bucketing: Shipping less, Changing order of assets

Shipping less assets via webpack
- JS Chunking
- CSS Chunking
- Mobile/Desktop Chunking
- Chunks on Demand

Modifying order of assets for SSR
- CSS Inlining - Js Optimization

- Key Tech Metrics - Business Metrics - Tools/Performance Monitoring
- Why is it VERY important
- Webpack Analyzer
- Continuous Integration

Speaker bio

Kanav Arora is head of FrontEnd Engineering at UrbanClap, heading their web and mobile development teams. Prior to UrbanClap, Kanav has worked as a Software Developer at Microsoft and Lead iOS Developer at silicon valley mobile gaming company, PocketGems. He was also the CTO of a startup named Stuph in the valley, before moving to India. Kanav holds a BS in Computer Science from UC Berkeley.




  • 1
    Sandhya Ramesh (@sandhyaramesh) Reviewer a year ago

    Hi Kanav, please note that to evaluate your proposal we need a link to either a video of you speaking in another conference or a two minute self recorded video of you explaining your talk.

    • 1
      Kanav Arora (@kanavarora) Proposer a year ago

      Hi. I actually did the same talk in the ReactJS Meetup in Bangalore, but unfortunately it wasn’t recorded. Will do a quick video and send it to you on Monday.

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