JSFoo 2016

Tackling speed and performance for JavaScript

##About JSFoo

JSFoo is India’s premier JavaScript conference. We launched JSFoo in 2011 as India’s first JavaScript conference. The JS community in India has grown phenomenally since. JavaScript now pervades every aspect of web development – browsers, apps, front-end, backend, mobile, and IoT.

##JSFoo 2016: Theme

Over the last few years, JavaScript has evolved to become the centerpiece of a complex web stack. Today, it is a prime subject of the obsession that lies with performance and speed. How can you get pages to load faster? How do you work with browser constraints to enhance speed? How do you measure performance? What actually is performance? In what ways do faster response times influence your architecture choices and plans? How is this new focus on faster page loads and apps working offline influencing the development of front-ends and backends as well as server side JS?

The theme for the 2016 edition is tackling speed and performance for JavaScript.

We are inviting full talks (40 mins), crisp talks (15 mins + 5 mins Q&A), and 3-6 hour long (hands-on) workshops from practitioners on the overall theme of speed and performance, including the following topics:

  • Architecting for performance – case studies on how you got faster response times
  • Best practices: debugging and profiling on the web, measuring performance
  • Handling large volumes of data in the browser
  • Building and deploying web apps eg webpack, travis
  • Modern web technology: Angular 2, React
  • Universal JavaScript: meteor js
  • Progressive Web Apps
  • JS off the web – raspberry pi, IoT
  • The cutting edge: elm

This year, JSFoo will feature two days of talks on JavaScript (15-16 September) and a single day of talks on design (17 September) at Meta Refresh (call for proposals will open shortly).

Guidelines for submission

Every proposal MUST be accompanied by:

  • A three minute preview video where the proposer gives an elevator pitch about the talk.
  • Detailed outline of the talk – either in the form of draft slides, mind map and/or textual description.
  • If you are proposing to speak on a topic where the code is not open-sourced yet, the editorial panel will consider your proposal only if the code is made open-source at least three weeks before the conference.

Without the above information, your proposal will not be considered for review.

If you are submitting a Workshop Proposal, you must clearly state:

  • Background knowledge that participants must possess in order to attend your workshop.
  • Details and links to software / packages which participants must install before coming to the workshop.
  • Laptop configuration.
  • Links to background reading material and GitHub repos.
  • Duration of the workshop.
  • Maximum number of participants who can attend your workshop.
  • Instructor’s past experience with conducting workshops.

There is only one speaker per session. Workshops can have two or more instructors.

Entry is free for selected speakers.

Due to budgetary constraints, we prefer speakers closer to home. But if we think you stand out, we’ll provide a grant to cover part of your travel and accommodation to Bangalore. Grants are limited and are made available to speakers delivering full sessions (40 minutes or longer) only.

Commitment to open source

HasGeek believes in open source as the binding force of our community. If you are describing a codebase for developers to work with, we’d like for it to be available under a permissive open source licence. If your software is commercially licensed or available under a combination of commercial and restrictive open source licences (such as the various forms of the GPL), please consider picking up a sponsorship. We recognise that there are valid reasons for commercial licensing, but ask that you support us in return for giving you an audience. Your session will be marked on the schedule as a sponsored session.

Important dates:

Deadline for submitting proposals: 29 August 2015
Conference dates: 15-16 September

JSFoo will be held at the MLR Convention Centre, J P Nagar.

For more information about speaking proposals, tickets and sponsorships, contact info@hasgeek.com or call +91-7676332020.

Hosted by

JSFoo is a forum for discussing UI engineering; fullstack development; web applications engineering, performance, security and design; accessibility; and latest developments in #JavaScript. Follow JSFoo on Twitter more

Ramanan Balakrishnan


Keep calm and track all

Submitted Aug 15, 2016

The quieter you become

With growing adoption of the web as the preferred mode of software delivery, knowing your (often anonymous) end users is becoming increasingly important. Identifying, listening and learning from them is often the best development decision that a company can make. In that vein, tracking user interactions online (using javascript trackers) will be the primary subject of this talk.

The Prime Directive has never been more applicable - you shall not interfere with the website’s performance. The focus of this talk will not be on developing amazing functionality, but rather the opposite - write javascript which is invisible to the user.

Starting with the use case of browser fingerprinting, this talk will also cover aspects of non-blocking delivery, asynchronous integration and silent operation of javascript trackers.


  1. Everyone’s a special snowflake

    With the web becoming richer everyday, it is becoming easier to identify distinct signatures in browsers. Recent research will be presented to make the case that anonymity among the crowds is no longer an easy task.

  2. You won’t feel a thing

    Convincing a kid to get his injections often requires more training than that for actually delivering the shot. So let’s also look at how we can efficiently load javascript into the browser. The emphasis will be on non-blocking, asynchronous delivery and loading of javascript packages.

  3. (quietly) Screaming into the void

    An efficient method to transmit collected data to the backend is presented. The emphasis will be on relaying information with minimal effect on actual site performance. This section also covers how modern trackers emit their data via 1x1 pixels.

  4. Keep calm and track all

    Finally, a summary of the presented techniques and tales from the trenches over the years.


Basic knowledge of how websites work (which I guess is everyone at the conference).

And an open mind, yes, definitely, an open mind.

Speaker bio

Ramanan is a software engineer at Semantics3, where he helps build analytics solutions for ecommerce. While he primarily works on enhancing the company’s intelligence capabilities, he has also been spotted diving into other aspects including development of user facing APIs. He has a keen interest in writing efficient code and always prefers removing code over writing more.

Apart from being a lockpicking enthusiast, he was previously an academic researcher investigating electromagnetics and signal processing for radar applications.




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Hosted by

JSFoo is a forum for discussing UI engineering; fullstack development; web applications engineering, performance, security and design; accessibility; and latest developments in #JavaScript. Follow JSFoo on Twitter more