Video: Leveraging the Event Loop for Blazing-Fast Applications!

This talk covers the event loop, microtask queue, and provides a live demo. JavaScript is single-threaded but can perform tasks that only a multithreaded environment can. The event loop consists of a call stack and microtask queue, which allow JavaScript to run non-blocking operations. Leveraging the microtask queue can lead to significant performance improvements in applications, such as React. However, it is important to use it correctly to avoid issues like infinite loops.

This talk has been presented at React Advanced 2023, check out the latest edition of this React Conference.

Michael Di Prisco
Michael Di Prisco
35 min
20 Oct, 2023

Comments

Sign in or register to post your comment.
  • Michael Di Prisco
    Michael Di Prisco
    Jointly
    Hey everyone, in my implementation I did a little mistake on stage, sorry for that. If you move the boolean at row 34 outside the callback (Row 33) at 18:27 you will effectively achieve the 100x performance improvement you were all waiting for! Sorry but the anxiety of the moment made me make a mistake there ;)

Check out more articles and videos

We constantly think of articles and videos that might spark Git people interest / skill us up or help building a stellar career

A Guide to React Rendering Behavior
React Advanced 2022React Advanced 2022
25 min
A Guide to React Rendering Behavior
Top Content
This transcription provides a brief guide to React rendering behavior. It explains the process of rendering, comparing new and old elements, and the importance of pure rendering without side effects. It also covers topics such as batching and double rendering, optimizing rendering and using context and Redux in React. Overall, it offers valuable insights for developers looking to understand and optimize React rendering.
Don't Solve Problems, Eliminate Them
React Advanced 2021React Advanced 2021
39 min
Don't Solve Problems, Eliminate Them
Top Content
Kent C. Dodds discusses the concept of problem elimination rather than just problem-solving. He introduces the idea of a problem tree and the importance of avoiding creating solutions prematurely. Kent uses examples like Tesla's electric engine and Remix framework to illustrate the benefits of problem elimination. He emphasizes the value of trade-offs and taking the easier path, as well as the need to constantly re-evaluate and change approaches to eliminate problems.
Scaling Up with Remix and Micro Frontends
Remix Conf Europe 2022Remix Conf Europe 2022
23 min
Scaling Up with Remix and Micro Frontends
Top Content
This talk discusses the usage of Microfrontends in Remix and introduces the Tiny Frontend library. Kazoo, a used car buying platform, follows a domain-driven design approach and encountered issues with granular slicing. Tiny Frontend aims to solve the slicing problem and promotes type safety and compatibility of shared dependencies. The speaker demonstrates how Tiny Frontend works with server-side rendering and how Remix can consume and update components without redeploying the app. The talk also explores the usage of micro frontends and the future support for Webpack Module Federation in Remix.
Speeding Up Your React App With Less JavaScript
React Summit 2023React Summit 2023
32 min
Speeding Up Your React App With Less JavaScript
Top Content
Watch video: Speeding Up Your React App With Less JavaScript
Mishko, the creator of Angular and AngularJS, discusses the challenges of website performance and JavaScript hydration. He explains the differences between client-side and server-side rendering and introduces Quik as a solution for efficient component hydration. Mishko demonstrates examples of state management and intercommunication using Quik. He highlights the performance benefits of using Quik with React and emphasizes the importance of reducing JavaScript size for better performance. Finally, he mentions the use of QUIC in both MPA and SPA applications for improved startup performance.
React Concurrency, Explained
React Summit 2023React Summit 2023
23 min
React Concurrency, Explained
Top Content
Watch video: React Concurrency, Explained
React 18's concurrent rendering, specifically the useTransition hook, optimizes app performance by allowing non-urgent updates to be processed without freezing the UI. However, there are drawbacks such as longer processing time for non-urgent updates and increased CPU usage. The useTransition hook works similarly to throttling or bouncing, making it useful for addressing performance issues caused by multiple small components. Libraries like React Query may require the use of alternative APIs to handle urgent and non-urgent updates effectively.
The Future of Performance Tooling
JSNation 2022JSNation 2022
21 min
The Future of Performance Tooling
Top Content
Today's Talk discusses the future of performance tooling, focusing on user-centric, actionable, and contextual approaches. The introduction highlights Adi Osmani's expertise in performance tools and his passion for DevTools features. The Talk explores the integration of user flows into DevTools and Lighthouse, enabling performance measurement and optimization. It also showcases the import/export feature for user flows and the collaboration potential with Lighthouse. The Talk further delves into the use of flows with other tools like web page test and Cypress, offering cross-browser testing capabilities. The actionable aspect emphasizes the importance of metrics like Interaction to Next Paint and Total Blocking Time, as well as the improvements in Lighthouse and performance debugging tools. Lastly, the Talk emphasizes the iterative nature of performance improvement and the user-centric, actionable, and contextual future of performance tooling.

Workshops on related topic

React Performance Debugging Masterclass
React Summit 2023React Summit 2023
170 min
React Performance Debugging Masterclass
Top Content
Featured WorkshopFree
Ivan Akulov
Ivan Akulov
Ivan’s first attempts at performance debugging were chaotic. He would see a slow interaction, try a random optimization, see that it didn't help, and keep trying other optimizations until he found the right one (or gave up).
Back then, Ivan didn’t know how to use performance devtools well. He would do a recording in Chrome DevTools or React Profiler, poke around it, try clicking random things, and then close it in frustration a few minutes later. Now, Ivan knows exactly where and what to look for. And in this workshop, Ivan will teach you that too.
Here’s how this is going to work. We’ll take a slow app → debug it (using tools like Chrome DevTools, React Profiler, and why-did-you-render) → pinpoint the bottleneck → and then repeat, several times more. We won’t talk about the solutions (in 90% of the cases, it’s just the ol’ regular useMemo() or memo()). But we’ll talk about everything that comes before – and learn how to analyze any React performance problem, step by step.
(Note: This workshop is best suited for engineers who are already familiar with how useMemo() and memo() work – but want to get better at using the performance tools around React. Also, we’ll be covering interaction performance, not load speed, so you won’t hear a word about Lighthouse 🤐)
React, TypeScript, and TDD
React Advanced 2021React Advanced 2021
174 min
React, TypeScript, and TDD
Top Content
Featured WorkshopFree
Paul Everitt
Paul Everitt
ReactJS is wildly popular and thus wildly supported. TypeScript is increasingly popular, and thus increasingly supported.

The two together? Not as much. Given that they both change quickly, it's hard to find accurate learning materials.

React+TypeScript, with JetBrains IDEs? That three-part combination is the topic of this series. We'll show a little about a lot. Meaning, the key steps to getting productive, in the IDE, for React projects using TypeScript. Along the way we'll show test-driven development and emphasize tips-and-tricks in the IDE.
Web3 Workshop - Building Your First Dapp
React Advanced 2021React Advanced 2021
145 min
Web3 Workshop - Building Your First Dapp
Top Content
Featured WorkshopFree
Nader Dabit
Nader Dabit
In this workshop, you'll learn how to build your first full stack dapp on the Ethereum blockchain, reading and writing data to the network, and connecting a front end application to the contract you've deployed. By the end of the workshop, you'll understand how to set up a full stack development environment, run a local node, and interact with any smart contract using React, HardHat, and Ethers.js.
Master JavaScript Patterns
JSNation 2024JSNation 2024
145 min
Master JavaScript Patterns
Top Content
Featured Workshop
Adrian Hajdin
Adrian Hajdin
During this workshop, participants will review the essential JavaScript patterns that every developer should know. Through hands-on exercises, real-world examples, and interactive discussions, attendees will deepen their understanding of best practices for organizing code, solving common challenges, and designing scalable architectures. By the end of the workshop, participants will gain newfound confidence in their ability to write high-quality JavaScript code that stands the test of time.
Points Covered:
1. Introduction to JavaScript Patterns2. Foundational Patterns3. Object Creation Patterns4. Behavioral Patterns5. Architectural Patterns6. Hands-On Exercises and Case Studies
How It Will Help Developers:
- Gain a deep understanding of JavaScript patterns and their applications in real-world scenarios- Learn best practices for organizing code, solving common challenges, and designing scalable architectures- Enhance problem-solving skills and code readability- Improve collaboration and communication within development teams- Accelerate career growth and opportunities for advancement in the software industry
Remix Fundamentals
React Summit 2022React Summit 2022
136 min
Remix Fundamentals
Top Content
Featured WorkshopFree
Kent C. Dodds
Kent C. Dodds
Building modern web applications is riddled with complexity And that's only if you bother to deal with the problems
Tired of wiring up onSubmit to backend APIs and making sure your client-side cache stays up-to-date? Wouldn't it be cool to be able to use the global nature of CSS to your benefit, rather than find tools or conventions to avoid or work around it? And how would you like nested layouts with intelligent and performance optimized data management that just works™?
Remix solves some of these problems, and completely eliminates the rest. You don't even have to think about server cache management or global CSS namespace clashes. It's not that Remix has APIs to avoid these problems, they simply don't exist when you're using Remix. Oh, and you don't need that huge complex graphql client when you're using Remix. They've got you covered. Ready to build faster apps faster?
At the end of this workshop, you'll know how to:- Create Remix Routes- Style Remix applications- Load data in Remix loaders- Mutate data with forms and actions
Vue3: Modern Frontend App Development
Vue.js London Live 2021Vue.js London Live 2021
169 min
Vue3: Modern Frontend App Development
Top Content
Featured WorkshopFree
Mikhail Kuznetsov
Mikhail Kuznetsov
The Vue3 has been released in mid-2020. Besides many improvements and optimizations, the main feature of Vue3 brings is the Composition API – a new way to write and reuse reactive code. Let's learn more about how to use Composition API efficiently.

Besides core Vue3 features we'll explain examples of how to use popular libraries with Vue3.

Table of contents:
- Introduction to Vue3
- Composition API
- Core libraries
- Vue3 ecosystem

Prerequisites:
IDE of choice (Inellij or VSC) installed
Nodejs + NPM