React App Hanging, Metro Bundler should activate within a few seconds of me running the "expo start" command, but lately it has been intermittently React Native app working fine in Remote Debugging (chrome) but Normally Hanging #26134 Closed rajashekar545 opened on Aug 21, 2019 A common problem you’ll find in React applications is finding React. React DevTools is a browser Issue The default minimum amount of time an app can be unresponsive before it is classified as hanging (2 seconds) does not suit me, and I'd like to adjust it. However, it seems to be hanging on the &quot;install&quot;: Hello. How can I make the process end and exit? When I created a simple next. exe" from task manager (if you use windows). If the main thread is extremely busy with different Welcome to React’s Concurrent Mode and Suspense — your secret toolkit for building blazing-fast, responsive UIs without drowning in spaghetti Describe the bug When I join a call on my react game and then execute the method hangUp (), I have a freeze which depends on the time it takes for the 2 requests to be sent just after Learn how to handle errors in React apps using Error Boundaries, the react-error-boundary library, and async error handling patterns Learn how to handle errors in React apps using Error Boundaries, the react-error-boundary library, and async error handling patterns Throttling navigation to prevent the browser from hanging - React Asked 4 years, 10 months ago Modified 4 years, 10 months ago Viewed 8k times How to Fix Hanging and Crashing Apps: A Comprehensive Guide Are you tired of dealing with hanging and crashing apps on your device? Whether you’re a gamer, a social media enthusiast, Fix slow React apps by tackling re-renders, bundle size, and memory leaks with effective optimization techniques. I created a sample application which worked fine before, but suddenly it is hanging when I'm running it using react-native run-android. This might take a couple of minutes. After running npm start (the start script is present in package. I decided to learn Next 13 by building something. I have a react app created by create-react-app. Create your own React components like Unnati Srivastava Posted on May 25, 2025 Why Your React App is Slow (And How to Fix It Like a Pro) # webdev # beginners # programming # I recently started out with react and whenever I run npx create-react-app my-app, a my-app directory is created with just a package. The app runs fine for just over an a hour but then it will freeze and the PC also freezes. xyz. When the user logged in I want to redirect the user on the root path or on App I've been encountering the "App hanging for at least 2000 ms" issue multiple times while using Sentry. Can't press buttons, can't input from, can't scroll but can open dev tools. These are classic symptoms of React’s default rendering behavior, where all state updates are treated as equally urgent. With multiple sizes and easy hanging strings, you can display them anywhere you want instant shimmer and a little whimsical brightness throughout the day. #212 Open PaulvanMotman opened on Nov 24, 2023 Why Do React Apps Lag? The Root Causes There are several reasons why React applications can experience lag, ranging from inefficient state management to rendering issues. I did a yarn start and relaunched to continue working on the layout and got the above While running the command npx create-react-app projectname , it is getting stuck at this point. Resolution This can be expected behaviour under certain circumstances. Unfortunately, when these applications begin to crash or hang unexpectedly, it can Nobody has time for buggy apps. Use the following guide to help you locate and The most important concept to understand for React error handling are error boundaries – little safety nets for your app. json as "start": "react-scripts start") the console says Starting the development terminal freezing when running create-react-app I am attempting to create-react-app but any time I try it looks like it is creating, then gets to a point where it just tells me "177 packages are looking for The Problem: I have been working on this site – app. I'm experiencing an issue where every time I dismiss a modal, action sheet, or Alert in our React Native app, the app completely freezes and can't be interacted with. I'm using Expo to develop a React Native application. We'll go through some common React errors and In this article, we will explore the reasons behind app malfunctions and provide six effective solutions for fixing hanging or crashing apps. I'm trying to run next build (yarn build) on my local machine to check for typescript warnings and build errors before deploying. NET template. ` There are no fatal events in sentry suggesting that the app crashes. However upon creating Contribute to annontopicmodel/unsupervised_topic_modeling development by creating an account on GitHub. Stack Trace OS Version: iOS 16. The root cause of this issue is because the dependency array of useEffect compares object/array by The white screen of death (WSOD) in React refers to a situation where our React application appears to have crashed and only displays a blank white screen. Slow component mounts, deep When I am starting a react app by "npm start" command in VScode terminal, it starts to loading forever on the browser. The app seems to be experiencing significant Working on a react application. However, it can be incredibly Hello, ever since launching update of Expo 48 to 50, we have been getting reports of errors `App hanging for at least 2000 ms. Let’s take a look at So, I've tried running npm i on my React app so that I can work concurrently on both front and back end at the same time. If your app has constraints not well-served by existing frameworks, you prefer to build your own framework, or you just want to learn the basics of a React app, Hello Dev forum, We’re trying to setup Okta SSO on our React application and we have a problem where instead of going to the route where the callback component from @okta/okta-react Implement React Suspense to manage async operations, and compare it with other async rendering methods such as the useEffect and React dev tools Another useful tool for measuring performance in a React app is the profiler of React DevTools. I am trying to create new Fullstack React + . I am waiting for it to proceed for hours. Microsoft Community A compelling reason to use React Native instead of WebView-based tools is to achieve at least 60 frames per second and provide a native look and when I run vite build aka npm run build the build performs without errors. Then end task "node. Happens for iOS devices only. memo (or the class component alternative of PureComponent) used all over the app since it’s a seemingly easy way to Troubleshooting: React App Stuck on "Starting the Development Server"In this video, we will walk you through troubleshooting steps for when your React app When I run "npm start" to run a React app , it doesn't give any errors but hangs forever instead Asked 7 years, 5 months ago Modified 5 years, 4 months ago Viewed 6k times Discover React error & exception-handling techniques, like React error boundaries & managing exceptions in user-friendly ways. In this article, we will explore the best Description I'm facing a weird problem on old devices with react native apps. NET project using the official React + . Memory leaks are a I have a React component which has 2000 elements and based on some filter conditions I update my state, which internally causes re-rendering. By re-registering your apps, you Here are a few other things to try: Check the dev server console - If you’re running Webpack’s dev server (or using Create React App or a similar tool), look at that terminal window for By Ben Edelstein React is usually pretty fast, but it’s easy to make small mistakes that lead to performance issues. Navigating to a new stack Troubleshooting npm start doesn’t detect changes When you save a file while npm start is running, the browser should refresh with the updated code. I realized that it happens with all the apps that I had developed with RN. Every time that I do a request to API React is not preventing infinite rendering/looping and results in freezing of browser. It just hangs. 5s load time Learn how to measure the performance of your React app and identify what's slowing it down. I'm testing using dockerhub image that's pretty much the stock version of create-react-app. 1 I had npm hanging on installation of electronjs on Windows 10. Error boundaries are React components that catch JS errors during Are your apps freezing or crashing in Windows 10? Don’t worry! In this video, we’ll show you how to fix these issues quickly using a simple PowerShell command. There are various Basic React Application keeps hanging on Localhost Ask Question Asked 5 years, 10 months ago Modified 5 years, 10 months ago Stop Freezing Your React Apps: The useTransition Fix Have you ever typed into a search input and noticed a frustrating delay before your I am working on Login/Register from in React and I am using firebase auth for authentication. But I keep getting confused with RSCs. Let’s dive into why this Welcome to React’s Concurrent Mode and Suspense — your secret toolkit for building blazing-fast, responsive UIs without drowning in spaghetti Let’s face it — React is fast until it’s not. If you get stuck while running create-react-app, just Ctrl + C to end the process in the terminal or CMD. If you move it to a pastebin and explain what is happening you might get some help. . Applies To All SaaS customers Erro 🚀 Why Your React App Is Slow — and How to Fix It After spending years working on large-scale React apps — including optimising BharatPe’s merchant dashboard from 1. but the process never finishes. I have a problem when creating new project in Visual Studio. Everything seems to be working fine. Something that can cause Performance optimization is a critical aspect of developing web applications. I see built in 4661ms. 2 (20C65) Report Version: 104 Application Specific Information: App hanging for at least 2000 ms. Learn the best practices for improving React performance, including solutions to common problems & tools Are your apps crashing or hanging on Windows 11? In this video, we'll guide you through simple and effective steps to fix these common issues. The app seems to be experiencing significant delays, and I'm having trouble App Hanging: App hanging for at least 2000 ms. But when I React Debugging Guide In this React debugging guide, we'll show how to create healthy React apps, with minimal bugs and maximal performance. sidekik. It polls the users hard-drive every few seconds and reads their code, detects Symptoms The reported stack trace for App Hanging events seems arbitrary. We would like to show you a description here but the site won’t allow us. json file, nothing Your UI doesn’t “randomly” refuse to update. If this doesn’t The Digital Employee Experience (DEX) is a metric to determine the quality of an employee’s experience with technology. While i was working on a react project, i encountered a problem that gave me a little bit of headache. When launch the task, it's React app hanging when typing on input with onChange state Asked 3 years, 9 months ago Modified 3 years, 9 months ago Viewed 418 times I've been encountering the "App hanging for at least 2000 ms" issue multiple times while using Sentry. In most cases, it’s rendering cached data, which is data that was saved somewhere so the app doesn’t have to do the same work again. I reinstalled and still it was hanging. When I tried it to start a second time, it was stuck: I tried to create a new You won't get help like this, especially not on reddit, where this sub talks about react, not really fixing react code. js app, and started it with npm run dev, it worked. I'm building an app with NextJs and Typescript. Have you ever noticed your React application getting slower the longer you use it? This could be a result of memory leaks. Describe the bug Sentry reports that for some iOS users, the app hangs for 2000ms or more due to this library Code snippet import MyApp from "MyApp"; import React, { useEffect } from 0 I'm trying to learn React Native. io Hanging After Sending Too Many Messages Asked 5 years, 7 months ago Modified 4 years, 8 months ago Viewed 2k times Create user interfaces from components React lets you build user interfaces out of individual pieces called components. There are a few potential causes for this issue: When that one slow component holds your entire app hostage, here's how to negotiate its release without touching its terrible code. I am completely new to that so I have no idea what and where could Therefore, it's essential to optimize your React app's performance to ensure it's fast, responsive, and efficient. xcodeproj, When the release mode is installed on my real device (the same problem happens even with production app from App Store), and when the app is opened from a background where it was I saw 'expo start' or 'npm start' command stuck at ''Starting metro bundler" and pretty much ever SO and GitHub question about this issue, but I am not seeing any debug Fix memory leaks in React apps by understanding common causes like event listeners, timers, and subscriptions, and how to clean them up properly. But I noticed it got installed on another In our increasingly digital world, mobile applications have become an indispensable part of our daily lives. This represents the minimum amount of time an app can be unresponsive before it is classified as hanging. You’ve probably been there: you build a sleek UI, everything works great in dev, but once your app It's my first time trying to use it, but after executing: create-react-app myproject I get: Creating a new React app in C:\\project Installing packages. 5s to 0. I am having some issues with electron app which is built using create-react-app. In today’s fast-paced digital world, we rely heavily on apps to perform a variety of tasks, from staying connected with loved ones to managing our finances. Users expect applications to load quickly and respond to their React npx create-react-app hangs and fails/aborts Asked 2 years ago Modified 2 years ago Viewed 157 times Page Unresponsive in Chrome My React app was working perfectly fine. Next build React's ecosystem is always growing, and it seems like there are always new features and enhancements to make development more effective One of the most frustrating things as a React developer is investing time and effort into building an application only to find it slow and unresponsive. Kindly help. This app basically loads forever at the product route. Or it works and I have encountered this scenario a few times during installation of create-react-app or when installing react dependencies. Reviewing Azure Container Apps logs and configuration settings can reveal underlying issues if your container app isn't behaving correctly. At a particular point in the UI, the browser tab freezes. The component has a lot of props and deploy to heroku Mobile App Steps create new react native app add a setInterval request in componentDidMount to fetch from the rails API put a console. Thread 0 How to fix your React app stuck at loading . log before and after the await press References: * facebook/react-native#36172 * facebook/react-native#38314 * facebook/react-native#36194 ## Test plan <!-- Provide a minimal The app hang detection integration has a default timeout of two (2) seconds. Missing libraries for React If you added React Native manually to your project, make sure you have included all the relevant dependencies that you are using, like RCTText. Description App hanging for at least 2000 ms. I'm deploying the create-react-app using docker on AWS ECS. I'm new to Next js and quite rusty in React. 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