React Performance

I want to share with you the steps I took in order to re-achieve a perfect 100 Google Lighthouse score.

When was the last time you tried your app out on the kinds of devices your end users are using? If you haven't, have you at least tried to simulate the kind of performance characteristics of your users on low-end devices?

If your useEffect function is running too often, triggering on every change, look at its dependencies. Here we use the functional form of setState to reduce how often the effect runs.

In this tutorial, we will discuss various methods of optimizing performance in React applications, and also the features of React that we can use to improve performance.

React's useMemo Hook can be used to optimize the computation costs of your React function components. We will got through an example component to illustrate the problem first, and then solve it with React's useMemo Hook.

In this guide, we’ll outline some problems associated with bloated lists and walk through steps to overcome these performance challenges in React applications.

In this blog post, we would be looking at different scenarios/cases on how React components render and re-renders. This is not to be an introductory post so, some prior knowledge of React would be a prerequisite.

This post is going to focus on React.memo and how to use it to avoid unnecessary rerenders of React components.

React's memo API can be used to optimize the rendering behavior of your React function components. We will got through an example component to illustrate the problem first, and then solve it with React's memo API.

We'll take a look at how Gatsby, which is a PWA generator, uses GraphQL to pull in data at build time and also its implications on performance.

In this article I will explain to you how you can optimize React performance by using React.memo, some common pitfalls you could encounter and why you shouldn't always use React.memo.

Measure the performance of our Next.js application with Web Vitals.

In this and the following articles, we will show you how to optimize the performance and stability of your apps. Thanks to the practices described in the guide, you will improve the user experience and speed up the time-to-market of your apps.

These days, you have to use a module bundler like webpack to benefit from a development workflow that utilizes state-of-the-art performance optimization concepts. Module bundlers are built by brilliant people just to help you with these difficult tasks.

How to use the (EXPERIMENTAL) interactions tracing API in React.

The short answer is "No". It does not give you any noticeable performance benefit.

Use native solutions to achieve smooth animations and gesture-driven interface at 60FPS.

In the first part of this article, I'll explain to you the most important concepts about rendering in React and how React decides to re-render a given component. In the second part, I'll show you what you can do to optimize the render performance of your React application.

Find the harmony between native and JavaScript to build fast-working and easy-to-maintain apps.

Use libraries dedicated to mobile and build features faster on many platforms at once, without compromising on the performance and user experience.

Find out how to use dedicated higher-ordered React Native components to improve user experience and performance of your apps.

Today, we'll look at measuring React component render performance with the React Profiler API, measuring interactions with React's new experimental Interaction Tracing API and measuring custom metrics using the User Timing API.

Learn how to monitor your components’ performance with the new ReactJS Profiler component.

How to set up performance monitoring for production React applications.

My top favorite tools for monitoring and optimizing my React components.

Has your React app been feeling kinda sluggish? Are you afraid of turning on the “paint flash” in Chrome DevTools because of what you might see? Try out these 5 performance tips!

Gatsby, an open-source tool for building high-performance JAMstack apps, boasts numerous plugins that extend its capabilities. For example, by leveraging source plugins in Gatsby, you can source data from multiple services, APIs, and even Excel spreadsheets.

Ensuring a high level of performance is key when developing any application, whether it be an API, a frontend app, or a backend app.

React Native was designed to bridge gaps between web and mobile frameworks in software development. Unfortunately, developers face certain hurdles related to performance when working with React Native.

Leveraging the stale-while-revalidate HTTP Cache-Control extension is a popular technique. It involves using cached (stale) assets if they are found in the cache, and then revalidating the cache and updating it with a newer version of the asset if needed. Hence the name stale-while-revalidate.

In this blog post I'm going to introduce several tipps and tricks to boost the performance of a React application.

How to optimize performance to deliver an awesome user experience.

In this post I will go over a real world example from my work at Wix where I was able to trim my bundle size by about 80% using Webpack Analyzer and React Lazy/Suspense.

This case study shows one way to implement partial Server-Side Rendering (SSR) and achieve performance gains without big investments in middleware for cloud-based platforms.

In this article, I will attempt to demystify the high-level strategies of the most popular CSS-in-JS libraries, discuss the performance issues they may introduce on occasion and finally consider techniques that we can employ to mitigate them. So, without further ado, let’s jump straight in.

Many react developers use a boilerplate to get their projects started. For me this boilerplate is create-react-app. While being great for reducing pain during development, not having to deal with Webpack and its perks and caveats has its pitfalls. One of these pitfalls hit me when deploying my app to a real server and running the Lighthouse audit with Chrome.

React Native SlowLog is a tool suitable for bigger performance problems in React Native.

Learn how to use idle-timeout in your React app to improve performance and security.

In this article I’ll attempt to share a few tips & optimization tricks that you should consider when aiming to minimize the footprint of your React app.

Over the past couple of years, anonymous functions have really taken off the React community.

How state colocation makes your app not only more maintainable but also faster.

However you put your app together, it’s always a good idea to ensure your components and state changes are triggering re-rendering as expected. That’s especially important if you have costly components to re-render.

How to use the React DevTools and React's profiling build to properly profile a production app.

Run Redux in Web Workers

After making an update to your component’s state using either useState or this.setState, parts of the component re-renders depending on the update.

How to start optimizing your React app renders

Building a great UI with React isn’t enough, You’ve got to add that extra glitter to make the app more polished, functional and remarkably better than the competition. This is exactly what I’m going to help you with as I describe some key methods to increase performance in React apps.

React.memo gives us the ability of pure components in React but for functional based components rather than class based ones.

In my experience, there are two main categories where I’ve found useMemo to be irrelevant, overused, and likely harmful to the performance of your application.

The react-native community has come up with good advice and tools to master the performance of react-native apps, such as learning about frame rates and how to use systrace, understanding over-rendering (also here), or using the Profiler component within react-native.

Back in November 2018, on a what we’ll say was a rainy day for the sake of setting a mood, we employed a seemingly routine React upgrade. This upgrade led us on an unexpected journey through our codebase, the Chrome memory inspector, and the React source code.

I’ve worked for a year optimizing one of the largest banks mobile apps performance. We ended up getting it from 14s TTI to around 2.5s on a slow Huawei P20 Lite. Here is what i wish i knew before starting!

In the frontend development community, we tend to use the word performance quite a lot. We all have the common goal of having a performant application. Brian Vaughan developed react-window with this in mind and he did a great job of giving us a powerful tool to achieve this goal.

useContext is not specifically designed for global state and there’s a caveat. Any change to context value propagates all useContext to re-render components.

To improve user interface performance, React offers a higher-order component React.memo(). By memoizing the rendered output, React skips unnecessary re-rendering.

Learn how to use useCallback and useMemo to optimize performance.

One key factor for positive user experience is speed i.e how much time a user has to wait to first see contents from your website or application.

What are the performance differences between Next.js and Create React App? Let’s unpack that question with some data, but first, we need to understand what exactly we are comparing here.

Without using React.memo, PureComponent, or shouldComponentUpdate.

Techniques you can implement to make your React app blazing fast.

Performance optimizations ALWAYS come with a cost but do NOT always come with a benefit. Let's talk about the costs and benefits of useMemo and useCallback.

This article is based on two years of experience building Nelio React Native Mobile Apps, available on iOS and Android.

Learn how to improve performance by implementing throttling and debouncing with lodash, underscore or RxJs.

If you aren’t measuring, you can’t even know if your optimizations are better, and you certainly won’t know if they make things worse!

In this article, we'll learn how to profile the performance of React apps using React Profiler, and leverage it to discover performance issues.

In this post, I’ll take another step in my performance series, and we will look into an optimization trick in React using memoization to boost performance!

So, recently I was thinking about performance profiling of a react app that I was working on, and suddenly thought to set a few performance metrics. And I did come across that the first thing I need to tackle is wasted renders I’m doing in each of the webpages.

In this post, we will look in depth at what React.PureComponent and the goodies it brings us.

The other day I was dealing with some laggy UI on a project and discovered React.memo as a way of fixing it. I don’t know how long React.memo has been a thing but it’s new to me and it’s amazing.

Tree-shaking is an important way to reduce the size of your bundle and improve performance. See how you can do it in your React apps.

In this post, we look at another optimization trick added in React v16.6 to help speed up our functional components: React.memo.

Are memoized functional components in React worth migrating to today? How much of a performance gain do they bring? We test and find out.

Say hello to the new perf hotness - a profiler built into React. This announcement blog post shows how to use it as a Chrome Extension, but you can also use it in your code, to get insight into real world interactions, even in production. Let's see how.

This article will cover how you can continue to work on the same React apps that you build, but to consider adding a number of optimizations to it. The key point here is to try and build your React site so that more people can use it.

5 simple tips to improve the performance of a React application

One of the most common issues that affects performance in React is unnecessary render cycles. React Components will re-render whenever their parents update, automatically, even when their props don’t change.

Do your React apps need a performance boost? Check out these top five things you can do today to increase the performance of your apps.

Profiling your React components may be the most important thing you can do to improve performance. Learn how to do this using the browser's User Timing API.

Before you replace Redux's <Provider> component with React's new context API, there's a thing or two that you should know about performance.

A React performance optimization tutorial which shows you React's shouldComponentUpdate lifecycle method and React's PureComponent API to prevent the rerendering of (child) components.

These days, to achieve optimal app load times when users visit our website, we are questioning every byte of code that is being transferred on the network.

If you are thinking of building a static site with React and want it to perform as fast as a cheetah, you should consider using GatsbyJS.

This is the first post of a three part series explaining some lessons learned running React in production.

I’ll talk about subscriptions first, and then we’ll move on to handling asynchronous task cancellation to avoid memory leaks in React (the main purpose of this article).

In this article, we gathered the typical approaches to debug and solve memory problems in a React Native app.

React 15.4.0 introduced a new performance timeline feature that lets you see exactly when components get mounted, updated, and unmounted. It also lets you visualize component lifecycles in relation to each other.

In this thorough beginner-friendly introduction to framework’s internals, we will demystify JSX, show you how React makes rendering decisions, explain how to find bottlenecks, and share some tips to avoid common mistakes.

Make your React app fly!

A review of common React performance pitfalls and how to avoid them.

This blog post is a case-study in the specific techniques I tried, and how well they worked.

You are probably really tired of me saying this, but fast DOM performance is one of the biggest feathers in React's cap.

I’ll be getting through the first lecture of a workshop, showing off some cool new OSS, and invariably somebody says: “inline functions? I heard those are slow.”

Treebo recently shipped a new Progressive Web App as their default mobile experience, initially using React and eventually switching to Preact in production.

Let’s talk about debugging and performance measurement.

How to improve React performance in production and avoid common mistakes.

React is usually pretty fast, but it’s easy to make small mistakes that lead to performance issues. Slow component mounts, deep component trees, and unnecessary render cycles can quickly add up to an app that feels slow.

In my last post, I discussed how unnecessary render cycles can negatively affect performance in React apps. However, in a large-scale app, it can be tricky to know which components are updating at any point in time.

One of the most common issues that affects performance in React is unnecessary render cycles. By default, React components will re-render whenever their parent renders, even if their props didn’t change.

The good news is: If you care about performance, it’s fairly easy to make any React application super fast.️ Here’s how.

The team spoke with hundreds of developers about how they build and scale their web applications, and I want to share some things we learned along the way.

We are going to use Chrome Perfomance Tab and new React DevTools Profiler plugin to profile a real application. We will learn how to use these tools to identify rendering problems and make user experience really smooth.

By combining a canvas rendering strategy with invisible React UI for manipulating video overlays on the client side, and ffmpeg on the backend, we were able to build a video editing experience in a matter of weeks that supports near pixel perfect previews that can be edited in real time, and highly optimised mp4 output for the fully rendered videos.

Do not worry about the performance of your React apps anymore, Jessica will take you through a how-to of performance improvement. We will look at how to use techniques to track and increase speed.

In this talk, we will look at the various tips and tricks for taking full advantage of React Native and using the performance attributes of the new architecture.

In this talk, I will go through some of the best practices you should consider from setting up a project, challenges most react native app faces to scalability. At the end of this talk, you will go home with practices you can apply to your projects and feel more confident doing so.

In this talk you’ll find out how some commonly used patterns have an adverse effect on the speed of your app, and how to avoid using them. We’ll mainly explore UI and state management but we’ll also dive into some native-specific issues and look at how to prevent them.

In this talk we’ll look at an app that does everything wrong. As we fix the problems, we’ll see how React is able reuse more DOM nodes and reconcile the component tree and the DOM faster, recreating fewer nodes. By the end we’ll have a model for reconciliation that will give us a solid foundation for remembering best practices and building performant applications.

Konstantin Raev talks about reaching React Native performance goals for Facebook Marketplace--one of Facebook's biggest applications.

Learn how to profile your React application and fix performance problems.

This talk is a deep-dive into building smooth, jank-free web experiences with React. We’ll look at how we can use Hooks and modern browser APIs to build incredible, delightful products that run great across devices.

Learn how to optimize the number of times your component renders in React with the memo function.

During this lightning talk, let's walk through the pros and cons of server-rendered applications, when you want to have it and what you can expect.

Let’s have a look on how you can do the same with Next.js, and if the principles still apply today. Is the user getting a better perceived experience when we turn off the client side JavaScript?

In this talk you’ll find out how some commonly used patterns have an adverse effect on the speed of your app, and how to avoid using them. We’ll mainly explore UI and state management but we’ll also dive into some native-specific issues and look at how to prevent them.

This talk demonstrates a very simple solution that can be dropped into pre-existing React applications to vastly improve the throughput of an SSR Node server (around 20-40x+).

In this talk you’ll find out how some commonly used patterns have an adverse effect on the speed of your app, and how to avoid using them. We’ll mainly explore UI and state management but we’ll also dive into some native-specific issues and look at how to prevent them.

If you use React and need to display large lists of data efficiently, you may be familiar with react-virtualized. It's a windowing library by Brian Vaughn that renders only the items currently visible in a list (within a scrolling "viewport").

The virtual DOM was a fantastic innovation. It brought about a much more productive way of writing web applications by allowing us to write our views in a declarative manner. This big benefit has little to do with performance of the initial render. Instead, it is the process of updating the DOM to reflect changes in your state has become much faster. This process of bringing the DOM in sync with the state is often referred to as DOM reconciliation.

React Native is amazing at helping you deliver in production live apps very quickly. But to get there, you sometimes have to cut corners. Once you have a successful app loved by thousands of users, you start to wonder how to tackle performance issues. Figuring out where to start can be tricky. This will be a practical guide about tools that can help you identify bottlenecks and quickly find ways to increase your app’s performance.

Have you ever wondered why good performance is so hard to achieve in heavy animated web applications? This talk is a practical retrospective on the discoveries, the pains and the journey that led me to build reliable bulletproof animations and transitions in real life production projects.

One of the crucial elements of performance is to ship relevant content to your users as soon as possible. But in modern web applications, figuring out what to ship and what to prioritize can be hard. Framework driven applications have the big disadvantage of being pretty heavy for the initial load. We will start from understanding how the browser works, then we will explain what the critical rendering path is and how we can optimize it.

Emma Wedekind and Jason Lengstorf work on converting Emma’s portfolio page to use `gatsby-image` for better performance and user experience. Along the way they talk about StaticQuery, GraphQL, and how Emma designs websites.

In this talk, we will delve into tuning an out-of-the-box Next.js application to serve thousands of requests on a single instance. Then how we achieved CDN-like performance while supporting dynamic content for Help Users Vote.

As web developCome join Kyle Mathews, founder of Gatsby, as he talks about modern web performance. You'll learn the tools & techniques you can start using today to make your React sites super fast. We’ll discuss code splitting, "link preload", greedy prefetching, header optimizations, service workers, and more using Gatsby as a case study for these techniques.