React Summit

React Summit 2023

<p>In this session, I will discuss our experiences in overcoming performance limitations while developing React components for web apps on low-end embedded devices such as Smart TVs. I will share actual application cases from the development of millions of webOS Smart TVs and show how we improved user input response and app launch time. The ideas and techniques shared will be beneficial to developers facing similar challenges.</p>

Overcoming Performance Limitations in React Components for Low-end Devices

Hi everyone. I'm so excited to talk about overcoming performance limitations in React components for low-end devices. My name is Seungho from LG Electronics, and I'm leading the INACT framework. INACT is a React-based app framework designed for TV UI components, remote control navigation, accessibility, and internationalization. It's used on millions of webOS TVs, including the apps you see on LG OLED TVs. In this talk, I will share our experiences in overcoming performance limitations when we create React components for those apps. Low-end devices, such as smart TVs and set-top boxes, often have limited hardware performance. This makes it challenging to develop high-performance web apps on these devices. There are lots of performance metrics, but in this talk, I will focus only on app launch time and scrolling performance. Let's talk about app launch time first. App launch time is one of the most important performance metrics on smart devices to deliver a native quality experience to users. When developing the INACT framework, the biggest challenge was to provide fast and smooth performance so that the user can tell if it is a native web or web app. So, how did we improve from left to right? To be obvious, we applied pre-rendering. You've probably seen this picture before. It's from the web.dev for explaining the server-side rendering. Since our goal is to develop pre-installed apps for the device, we choose a structure that is closer to CSR with pre-rendering. This is a very simplified version of our pre-rendering flow. This is a typical React app build. We transpile the JSX and ES6 code and package it. At this build time, we use the node server to call the render to string function. This generates the HTML for the first screen and we package the app with this HTML. When we run the app, we call the hydrate root function instead of the create root function. To support over 200 locales, we generate the pre-rendered HTML for each locale at build time. Duplicate content is saved as multi.html. A locale.json file maps the locale to the HTML file and an app import.json file, which is the M metadata, specifies the HTML file as the main entry point. Pro tip. We use VS Snapshot for system apps. This is a highly specific operation and definitely is an idea for everybody. However, it is useful in certain scenarios and this will help simplify the process. We made the snapshot plugin and it assumes usage of React. This plugin requires you to obtain an MKS snapshot binary. It is usually tied to the specific version of Chromium that you are targeting. Pay careful attention to have matching versions. Launch time depends on the complexity and size of the app, but generally the VS Snapshot made app launch time faster by more than 30%. Let's talk about scrolling performance. On TV devices, media type apps like the Media Player need to scroll through many great items. Therefore, ensuring smooth scrolling is critical to provide a native quality experience to users. So, how did we improve from left to right? To handle very long list items, we created the virtual list component. Virtualized techniques are now in common and there are many great virtualized list components out there. The idea of virtualization is that instead of creating all new DOM nodes, we recycle them into visible DOM nodes. This screen is a layer of virtual list component. There is a long container div that is the full height of the entire list. Each item element is above it. We create each of these item DOM nodes in slightly larger numbers than the visible viewport. As the user scrolls down the list, we scroll the container div. When the first item leaves the viewport, we move it to the bottom of the items. In this way, we recycle the DOM. This is a simple flow of virtual list in translate mode. We call it translate mode because we are moving the container div with the translate3d function. When the user rotates the wheel, we listen to the onWheel event. From this event information, we calculate the distance to be moved. In the animator, we move the container by calling translate3d function. As the container moves, we virtualize items. And this behavior is done inside the request animation frame. However, this wasn't enough to achieve 60 FPS on low-end devices. So, we try to delegate scrolling to the browser. We call it native mode because the browser is moving the container div. This eliminates the distance calculation and the entire behavior of moving the container within the request animation frame. Instead, we only needed to look at the onScroll event and handle the item virtualization within that event. Finally, we were able to achieve 60 FPS on all devices. TBFs need to support scrolling via remote control up and down keys. To move the container element via the arrow keys, we call the scroll2 function. Use the smooth option for zoomed scrolling. For continuous key input, we need to calculate the proper coordinate and select the smooth or instant options. From the previous native mode flow, we need to add onKeyDown event handler. In this handler, we calculate the coordinate and call scroll2 function to move the container element. We are now on the final page. Let's summarize. To improve app launch time, we have used pre-rendering and VSNFShot. To improve scrolling performance, we have used virtualization with native scrolling. By applying these techniques, we have been able to create high-performance React components that deliver native quality experience on low-end devices. Thank you for watching, everybody. I hope you really enjoyed my presentation and found it useful. Bye!


Seungho Park

We're bringing free articles, videos, courses, and tutorials to help you learn all about ReactJS, whether you're a beginner or a pro. Introduced in 2011, the framework has become essential for web and mobile developers alike, enabling modern apps by look and function. And while other JS tools have expanded or revised its original notions, React's popularity is still the one to beat.

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Blockchain is a distributed ledger technology that uses cryptography to store data securely and immutably across a network of computers. It is a digital ledger of records, called blocks, which are linked together using cryptographic principles. Each block contains a timestamp and a link to the previous block, forming an immutable chain. This makes it virtually impossible to tamper with the data stored in the blockchain, as any changes would be easily detected by the network. In the context of JavaScript, blockchain can be used to create distributed applications (dApps) which are secure, transparent, and decentralized.

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Build tools are programs that automate the process of creating a software application. They are used to compile source code, run tests, package applications, and deploy them into production environments. Build tools help developers save time by automating the process of building an application from its source code. In JavaScript development, build tools like Grunt, Gulp, Webpack, and Browserify can be used to automate tasks such as minifying code, running unit tests, and compiling Sass or Less files.

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DevTools is a set of web development tools built into the Chrome browser. They allow developers to inspect and debug HTML, CSS, and JavaScript code on any web page. DevTools provides access to the Document Object Model (DOM), allowing developers to view the structure of a page and make changes to it in real-time. It also provides features such as network performance analysis, JavaScript debugging, and memory profiling, which help developers optimize their code.

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SSR stands for Server-Side Rendering. It is a technique used to render web pages on the server side instead of the client side. This allows for faster loading times and better SEO performance, as the content is already available on the server before it is sent to the user's browser. SSR is often used in JavaScript applications, where the HTML is generated on the server and then sent to the client.

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Frameworks are collections of pre-written code that provide a structure for developers to build applications. Frameworks help developers save time by providing ready-made components and tools that can be used to quickly develop an application. In the JavaScript domain, popular frameworks include React, Angular, Vue, and Node.js. These frameworks provide developers with a set of features such as component-based development, routing, state management, and more. By using these frameworks, developers can create powerful web applications faster and easier than ever before.

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Talks, Workshops, Tutorials and Presentations on JavaScript Frameworks

Gatsby is a modern web framework based on React and GraphQL. It helps developers to create fast websites with minimal effort. Gatsby provides an easy-to-use API that allows developers to quickly create high-performance websites with features like server-side rendering, routing, code splitting, and more. With Gatsby, developers can build SEO-friendly, dynamic websites with the power of React and GraphQL.

This page is dedicated to helping JavaScript developers improve their skills with Gatsby. Here you will find a variety of talks, workshops, tutorials and presentations about Gatsby, all designed to help you become an expert in this popular JavaScript framework. Whether you are a beginner or experienced developer, you can find the resources you need to take your Gatsby skills to the next level.

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Accessibility in JavaScript refers to the ability of a website or application to be used by people with disabilities. This includes providing features such as support for keyboard navigation, alternative text for images, and high-contrast color schemes. Accessible JavaScript also means that code is written in a way that can be understood and used by all users, regardless of their disability.

This page contains talks, workshops, tutorials and presentations about accessibility for JavaScript developers. Learn how to create accessible websites and applications that are usable by everyone, regardless of physical or cognitive abilities. Discover best practices for making your content work for all users, including those with visual, auditory, motor, and cognitive impairments. Gain practical advice on how to use HTML, CSS, and JavaScript to ensure maximum accessibility.

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Automation is the process of using computers and software to perform tasks that would otherwise be done manually. In JavaScript, automation is used to automate repetitive tasks or processes, such as running tests, deploying code, or building and deploying web applications. Automation can also be used to optimize processes by streamlining them and making them more efficient.

Automation is the process of using technology to reduce or eliminate the need for manual labor. Automation can help increase efficiency and accuracy, while reducing costs. With this page, you will find talks, workshops, tutorials and presentations to help JavaScript developers learn more about automation and how to use it in their projects. Learn about the latest trends, best practices, and tools available for automation, and how to get started with automating your code.

Automation Talks, Workshops, Tutorials and Presentations for JavaScript Developers

Webpack is a module bundler for modern JavaScript applications. It takes modules with dependencies and generates static assets representing those modules. Webpack provides a unified approach to bundling, transforming, and loading all of your project's static assets. It allows you to write modular code and bundle it together into small packages to optimize load time. Webpack also provides plugins and loaders that allow you to preprocess, minify, and transpile your code so it can run in different environments.

Webpack is a powerful and popular open source JavaScript module bundler, used to compile and bundle all of the projects dependencies into a single file. This page contains talks, workshops, tutorials and presentations about webpack, designed to help JavaScript developers understand how to use webpack for their projects. Learn how to configure webpack, optimise build times, debug issues and more from experienced professionals.

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Web apps are applications that run on the web and can be accessed through a web browser. They are written using JavaScript, HTML and CSS, allowing them to be accessible from any device with an internet connection. Web apps are often interactive and provide a user interface for users to interact with. They can range from simple one-page websites to complex applications that allow users to perform tasks such as online shopping or banking.

This page contains talks, workshops, tutorials and presentations about web apps, a popular technology for creating interactive websites. Our materials are designed to help JavaScript developers gain the skills they need to build powerful and engaging web applications. We offer a range of topics, from basic concepts to advanced techniques, that will teach you how to create dynamic user experiences using HTML, CSS, JavaScript, and more. Learn how to create responsive designs, use AJAX for data transfer and manipulation, and integrate third-party APIs into your projects. With our resources, youll be able to develop robust, feature-rich web apps quickly and easily.

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Frontend refers to the part of a website or application that users interact with. It is typically built using HTML, CSS and JavaScript to create an interface that allows users to view and interact with content. Frontend developers are responsible for creating the visual elements of a website or application, such as layout, styling, animation, and user interaction. This includes designing how a page looks, how it responds to different events, and how it interacts with the user.

The page contains talks, workshops, tutorials and presentations about frontend and is designed for JavaScript developers looking to improve their knowledge and skills in this area. Here you can find the latest insights, tools and techniques to help you stay up-to-date with the ever-changing frontend landscape. Whether youre a beginner or an experienced developer, youll find something to help you become a better frontend engineer.

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Packaging in the context of JavaScript is a way of bundling multiple files and/or libraries into one single file. This helps to reduce the number of requests that need to be made to the server when loading a website, as well as decrease the size of the application. It also helps to make the code easier to maintain and debug. Popular tools for packaging JavaScript include Webpack, Parcel, and Rollup.

Packaging is an important part of any JavaScript development project. It involves bundling the code and resources into a format that can be used by other developers or deployed to production environments. This page contains talks, workshops, tutorials and presentations about packaging for JavaScript developers. Learn how to create efficient packages for your projects, as well as tips for troubleshooting and debugging common packaging issues. Discover the best practices for using package managers like npm and yarn, and get insights into the future of JavaScript packaging.

Packaging Talks, Workshops, Tutorials and Presentations for JavaScript Developers

A bundler is a tool that helps to simplify the process of managing and organizing JavaScript modules. It allows developers to combine multiple separate JavaScript files into one bundle file, which can then be included in an HTML page. This makes it easier to manage code, as well as reducing the number of requests the browser needs to make when loading a page. Bundlers also provide features like minification, transpilation, and tree-shaking, making it easier for developers to write modern JavaScript code and optimize their applications for performance.

The page contains talks, workshops, tutorials and presentations about bundler. Bundler is a powerful tool for JavaScript developers that helps in bundling and managing dependencies. It is an essential tool for creating and organizing applications and libraries. This page provides comprehensive information on Bundler, including its features, benefits, best practices, and more. With the help of this page, you can learn to use Bundler efficiently and effectively. You will find talks, workshops, tutorials, and presentations that will help you understand and master the tool.

Bundler Talks, Workshops, Tutorials & Presentations for JavaScript Developers

NPM stands for Node Package Manager. It is a package manager for the JavaScript programming language. It is used to install, share, and manage code packages that are used in JavaScript projects. It helps developers to easily find, share, and reuse code with other developers from around the world. It also helps maintain the versioning of libraries, making sure that everyone is using the same version of the code.

NPM (Node Package Manager) is an essential tool for JavaScript developers. It allows you to install, manage, and publish packages of code that can be used in your projects. With NPM, you can easily find, share, and reuse packages of code from the vast online repository of packages. Our talks, workshops, tutorials, and presentations will help you learn how to use NPM effectively and get the most out of it. Well cover topics such as package installation, versioning, publishing, and more. Whether youre a beginner or an advanced user, these resources will give you the skills you need to make the most of NPM.

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Virtual Reality (VR) and Augmented Reality (AR) are two forms of computer-generated simulations that allow users to interact with a virtual environment. VR is an immersive experience where the user is completely surrounded by a 3D world, while AR overlays digital elements onto the real world. In terms of JavaScript, developers can create interactive experiences for both VR and AR using web technologies such as HTML, CSS, and JavaScript.

This page contains talks, workshops, tutorials and presentations about the exciting new technologies of Virtual Reality (VR) and Augmented Reality (AR). Learn from experts in the field and get up to speed on the latest advancements in this rapidly evolving industry. Discover how to create immersive experiences with VR and AR, and gain insights into how these powerful tools can help developers create groundbreaking applications. Whether youre a seasoned professional or just getting started, our resources will help you become a master of VR and AR development.

VR and AR: Talks, Workshops, Tutorials & Presentations for JavaScript Developers

Automated security is a process of using automated software tools to detect and prevent malicious activities, such as data breaches, unauthorized access, and other cyber threats. These tools can be used to monitor networks, applications, databases, and system configurations in order to identify and respond to any suspicious activity or potential vulnerabilities. Automation helps to reduce the time and resources needed to manage security, allowing organizations to focus on more pressing tasks. In addition, automated security tools can be used to identify JavaScript-based attacks, such as cross-site scripting (XSS) or SQL injection.

This page provides talks, workshops, tutorials and presentations about automated security for JavaScript developers. Learn how to use automated security tools to protect your web applications from malicious attacks, and discover the best practices for keeping your code secure. Get up to speed on the latest technologies and techniques for preventing data breaches, reducing vulnerabilities, and ensuring the safety of your application. Our experts will guide you through the process of implementing automated security measures in your projects, so that you can stay ahead of potential threats.

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Storybook is a tool used to develop and design user interfaces (UI) in JavaScript. It allows developers to create components that can be reused throughout their application, as well as visualize how the UI will look and behave before it goes live. Storybook also enables developers to quickly prototype and iterate on their designs with hot-reloading of changes. Storybook also offers a number of add-ons that allow developers to easily integrate testing and automation tools into their workflow.

Storybook is a powerful tool for JavaScript developers to create, maintain and share UI components. It allows developers to quickly build simple, reusable components that can be used in any project. With Storybook, developers can easily create and test their components in isolation, without having to worry about the whole application or other dependencies. Storybook also provides an intuitive interface for developers to collaborate on their components, making it easier to share and reuse code. With Storybook, developers can create beautiful, interactive user interfaces with ease. From talks and workshops to tutorials and presentations, Storybook is the perfect tool for any JavaScript developer looking to create and maintain stunning user interfaces.