React profiler chrome

SummaryHi there React team! ⚛️ 👋This change is a proof of concept of how the new Chrome DevTools Performance extension API ( can be used to surface React runtime data directly in the Chrome DevTools Performance panel.To do this, the hooks in profilingHooks.js that mark beginning and end of React measurements using Performance marks are modified to also use Performance measure with the detail field format specification of the Performance extension API.Because these marks are used by React Profiler, they are kept untouched and the calls to performance.measure are added on top to surface them to the Chrome DevTools Performance panel, along with the browser's native runtime data.Because this is a proof of concept, not all the tasks and marks taken by the React Profiler are added to the Chrome DevTools Performance panel (f.e. update scheduling marks), but this could be done as a follow up of this commit.Note: to enable the user timings to be collected in the first place, the React DevTools extension needs to be installed (so that the hooks are loaded to the website). In an alternative approach, the calls to the api could be added directly to the framework so that no extension needs to be installed, but this would require a more careful implementation.MotivationWe (the Chrome Page Quality team) think allowing developers to extend the Chrome Peformance Panel can significantly offer a better experience for developers looking to improve performance to the current solutions available.Right now, the React Profiler has its own implementation of a timeline that parses a Chromium's trace data and merges it with its own instrumentation data. This is problematic becauseIt fragments the developer workflow: Users are required to profile with React DevTools and with the browser profiler (the Performance panel). After the recording is finished the output of the Performance panel (browser trace data) needs to be imported into the React profiler.Insufficient details in specialized tools: Users might still need a more detailed view of the browser runtime which is not available in specialized tools like the react profiler (f.e. dropped frames). This leads them to frequently jump back and forth between tools to obtain the whole picture.Broken deps: Changes to the upstream trace data format will cause the React profiler to break (f.e. React profiler doesn't support the current format exported by the Chrome Performance panel)Cost of maintenance: Framework tool developers need to implement and maintain code that mimics the functionality of the native browser tools (f.e. JS flamechart, network lane, etc.).With the proposed API this problems could be significantly alleviated and it could potentially yield to an overall better experience for web developers.For reference, here's at an example of a timeline recorded by React's profiler being surfaced to

As a developer working with the open-source React JavaScript library, having a powerful tool to inspect and analyze React component hierarchies is essential. This is where the React Developer Tools Chrome extension comes into play. With a total rating of 4.058001397624039, this extension has proven to be a valuable asset for React developers worldwide. Unleash the Power of React Developer Tools Upon installing the React Developer Tools Chrome extension, you'll find two new tabs in your Chrome DevTools: "⚛️ Components" and "⚛️ Profiler". These tabs provide essential functionalities to enhance your React development workflow. Inspect and Analyze Components The "⚛️ Components" tab allows you to explore the React component tree rendered on the page. It provides a comprehensive view of the root React components, as well as their corresponding subcomponents. By selecting a component in the tree, you can delve into its current props and state, enabling you to debug and make necessary changes directly in the panel on the right. Additionally, the breadcrumbs feature allows you to navigate through the chain of component creation, gaining insights into the relationships between different components. Moreover, if you inspect a React element using the regular Elements tab, you can seamlessly switch to the React tab, and the corresponding element will be automatically selected in the React tree. This integration ensures a smooth and efficient development experience. Optimize Performance with the Profiler The "⚛️ Profiler" tab is a game-changer when it comes to optimizing the performance of your React applications. With this tab, you can record performance information and identify bottlenecks in your code. By analyzing the collected data, you can make informed decisions to optimize your application's performance and deliver a seamless user experience. Unlock the Full Potential of React Developer Tools While React Developer Tools is a Chrome extension, it does not compromise your privacy. It requires permissions to access the page's React tree, but it does not transmit any data remotely. Furthermore, being fully open-source, you can explore and contribute to its development by accessing the source code at Don't just take my word for it! Let's hear what other

Unnecessary renders · why-did-you-render· hydration cost · expensive renders and effects · react profiler · chrome devtools · unnecessary renders · why-did-you-render· hydration cost · expensive renders and effects · react profiler · chrome devtools · suspense · redux & context · react 18 · layout thrashing · browser’s render loop · virtualization· suspense · redux & context · react 18 · layout thrashing · browser’s render loop · virtualization· cdns · render-blocking resources · critical css · webp and avif · font subsetting · responsive images · http2 & http3 · hydration cost · cdns · render-blocking resources · critical css · webp and avif · font subsetting · responsive images · http2 & http3 · hydration cost · third parties · cache-control · webpagetest · staying fast · prefetching · third parties · cache-control · webpagetest · staying fast · prefetching · Since 2017, Ivan Akulov has been helping companies like Framer, Restream, Toggl, and dozens more make their apps and sites faster. Over those years, Ivan has developed a step-by-step approach to improving web performance. Now, he’s teaching this approach to other engineers.⚛️ React Performance Masterclass. In the React workshop, we take several slow apps → profile them → and fix each of them. Along the way, we learn numerous performance tools and encounter all the common React performance antipatterns.The workshop covers both basic (useMemo(), Chrome DevTools, React Profiler) and advanced topics (React Context, why-did-you-render, useTransition, virtualization, and many more). Full program · Free bonus materials🌸 Core Web Vitals Masterclass. In the Core Web Vitals workshop, we take several slow apps → profile them → and fix them. In the process, we learn how to improve each Core Web Vital, use tools like Lighthouse and WebPageTest, and solve common issues you might encounter in the wild.The workshop covers things like render-blocking resources, responsive images, font optimization, preloading, and more. Full program

نظرة عامةAdds React debugging tools to the Chrome Developer Tools.Created from revision 44c3d3d665 on 2/7/2025.React Developer Tools is a Chrome DevTools extension for the open-source React JavaScript library. It allows you to inspect the React component hierarchies in the Chrome Developer Tools.You will get two new tabs in your Chrome DevTools: "Components ⚛" and "Profiler ⚛".The Components tab shows you the root React components that were rendered on the page, as well as the subcomponents that they ended up rendering.By selecting one of the components in the tree, you can inspect and edit its current props and state in the panel on the right. In the breadcrumbs you can inspect the selected component, the component that created it, the component that created that one, and so on.If you inspect a React element on the page using the regular Elements tab, then switch over to the React tab, that element will be automatically selected in the React tree.The Profiler tab allows you to record performance information.This extension requires permissions to access the page's React tree, but it does not transmit any data remotely. It is fully open source, and you can find its source code at (2/7/2025)تم التحديث9 فبراير 2025محتوى مقدّم منMetaالحجم1.57MiBاللغاتمطوّر برامجMeta Platforms, INC.1 Meta WayMenlo Park, CA 94025US البريد الإلكتروني [email protected] هاتف +1 650-543-4800تاجريُعرِّف هذا المطوّر نفسه بصفته جهة تجارية بموجب التعريف الصادر عن الاتحاد الأوروبي، ويلتزم بتقديم منتجات أو خدمات تلتزم بالقوانين المتّبعة في الاتحاد الأوروبي.‏نظام ترقيم البيانات العالمي (DUNS)196337864الخصوصيةأفصَح المطوِّر عن أنّه لن يتم جمع بياناتك أو استخدامها.يُقِرّ هذا المطوِّر بأنّ بياناتك:لا يتم بيعها لأطراف ثالثة خارج إطار حالات الاستخدام المُتفَق عليها.لا تُستخدَم أو تُنقَل لأغراض غير متعلِّقة بالوظيفة الرئيسية للعنصر.لا تُستخدَم أو تُنقَل لتحديد الأهلية الائتمانية أو لأغراض الإعارة.دعمللحصول على مساعدة بخصوص الاستفسارات أو الاقتراحات أو المشاكل، انتقِل إلى الموقع الإلكتروني لدعم المطوّرين.ذات صلةLocatorJS4.3(72)LocatorJS Chrome Extension - option-click to code (ReactJS)Angular state inspector4.7(64)Helps you debug Angular component state. Supports Angular 1/2+/Ivy!MobX Developer Tools3.3(53)Dev-tools for MobX and Reactdaily.dev | The homepage developers deserve4.8(2.5 ألف)Get one personalized feed for all the knowledge you need as a developer.Redux DevTools4.6(728)Redux DevTools for debugging application's state changes.React Context DevTool4.5(23)Devtool for React Context and useReducerJSON Formatter4.6(1.9 ألف)Makes JSON easy to read. Open source.Vue.js devtools4.2(2.1 ألف)DevTools browser extension for Vue.jsVercel4.6(25)Use the Vercel Toolbar on production deploymentsTesting Playground4.3(59)Simple and complete DOM testing playground that encourage good testing practices.GraphQL Network Inspector4.7(128)Simple and clean network inspector for GraphQLGraphQL developer tools3.0(24)Devtools panel for GraphQL developmentLocatorJS4.3(72)LocatorJS Chrome Extension - option-click to code (ReactJS)Angular state inspector4.7(64)Helps you debug Angular component state. Supports Angular 1/2+/Ivy!MobX Developer Tools3.3(53)Dev-tools for MobX and Reactdaily.dev | The homepage developers deserve4.8(2.5 ألف)Get one personalized feed for all the knowledge you need as a developer.Redux DevTools4.6(728)Redux DevTools for debugging application's state changes.React Context DevTool4.5(23)Devtool for React Context and useReducerJSON Formatter4.6(1.9 ألف)Makes JSON easy to read. Open source.Vue.js devtools4.2(2.1 ألف)DevTools browser extension for Vue.js

Into smaller chunks and loading only what is needed can help reduce initial load times and improve performance.Lazy Loading: Lazy loading components and resources can help optimize performance by loading them only when they are needed.Optimizing Images: Compressing and optimizing images can help reduce load times and improve overall performance.Minifying and Bundling: Minifying and bundling your JavaScript and CSS files can help reduce file sizes and improve load times.By incorporating these techniques and using performance monitoring tools, you can effectively profile key metrics and track the performance of your React application. Improving React performance will not only enhance user experience but also boost SEO rankings and overall business success.Optimizing React Performance with Monitoring Tools This is the part where we explore some of the top tools and techniques for monitoring and improving React performance.Why Performance Monitoring is ImportantMonitoring the performance of your React applications is crucial for several reasons. Slow loading times and unresponsive user interfaces can lead to a poor user experience, increased bounce rates, and lower conversion rates. By identifying and fixing performance bottlenecks, you can improve the overall speed and responsiveness of your application, leading to higher user satisfaction and retention.Key Features of React Performance Monitoring ToolsReal-time Monitoring: Provides real-time insights into the performance of your React application, allowing you to identify issues as they occur.Performance Profiling: Allows you to profile your application's performance, identify bottlenecks, and optimize code for improved speed and responsiveness.Alerting and Notifications: Sends alerts and notifications when performance metrics exceed predefined thresholds, enabling you to take immediate action.Integration with Development Tools: Integrates with popular development tools like VS Code and Chrome DevTools for seamless performance monitoring and debugging.Top React Performance Monitoring Tools1. React DevToolsReact DevTools is an official browser extension for Chrome and Firefox that allows you to inspect React component hierarchies, track re-renders, and analyze performance. With React DevTools, you can identify unnecessary re-renders, optimize component lifecycles, and improve overall application performance.npm install react-devtools2. React ProfilerReact Profiler is a built-in tool in the React Developer Tools that allows you to profile component rendering times and interactions. By using React Profiler, you can identify components that are causing performance bottlenecks and optimize their rendering logic for improved performance.npm install react-profiler3. LighthouseLighthouse is an open-source tool from Google that provides detailed performance reports for web applications. By auditing your React application with Lighthouse, you can identify areas for improvement in performance, accessibility, best practices, and SEO.npm install lighthouse4. SentrySentry is a comprehensive error and performance monitoring tool that helps you track down and fix issues in your React application. With features like performance metrics, error tracking, and release monitoring, Sentry provides a complete solution for monitoring and optimizing React application performance.npm install @sentry/reactBest Practices

Testing, and optimization. By using performance monitoring tools and implementing techniques to improve React application performance, you can deliver faster, more responsive applications that provide a superior user experience.Remember, a well-optimized React application not only improves user satisfaction but also contributes to higher conversion rates and better search engine rankings. Stay proactive in monitoring and optimizing your React applications to stay ahead of the competition and provide a stellar user experience.React Performance Monitoring Tools and Techniques This is where performance monitoring tools and techniques come into play to help you profile key metrics and track React performance effectively.The Importance of React Performance MonitoringMonitoring the performance of your React application is crucial for ensuring a smooth user experience. Slow load times, janky animations, and unresponsive UI elements can all lead to user frustration and abandonment. By using performance monitoring tools, you can identify bottlenecks, optimize your code, and ultimately improve the speed and responsiveness of your React application.Key Metrics to Track for React PerformanceWhen monitoring the performance of your React application, there are several key metrics that you should track to get a clear picture of how your application is performing. Some of the important metrics include:First Contentful Paint (FCP): This metric measures how long it takes for the first content to be painted on the screen. A fast FCP is essential for providing a perceived fast loading experience to users.Time to Interactive (TTI): TTI measures how long it takes for the page to become fully interactive. A slow TTI can lead to a poor user experience as users may not be able to interact with the page until it fully loads.Memory Usage: Monitoring the memory usage of your React application is important to identify memory leaks and optimize performance.Rendering Performance: Tracking the time it takes to render components and update the DOM can help pinpoint performance issues in your application.Popular React Performance Monitoring ToolsThere are several performance monitoring tools specifically designed for React applications that can help you track and optimize key metrics. Some of the popular tools include:React Developer Tools: This Chrome extension allows you to inspect the React component hierarchy, track component updates, and profile performance.React Profiler: This built-in tool in React allows you to profile the performance of your application and identify slow components.Webpack Bundle Analyzer: This tool helps you analyze the size and contents of your Webpack bundles, allowing you to optimize bundle size for better performance.Lighthouse: This open-source tool from Google helps you audit the performance, accessibility, and SEO of your web applications, including React applications.Techniques for Improving React PerformanceIn addition to using performance monitoring tools, there are several techniques you can implement to improve the performance of your React application:Code Splitting: Splitting your code