this repo has no description
kitten.sh
1<!doctype html><html lang=en dir=ltr class="docs-wrapper plugin-docs plugin-id-default docs-version-0.79 docs-doc-page docs-doc-id-profiling" data-has-hydrated=false><meta charset=UTF-8><meta name=generator content="Docusaurus v3.8.0"><title data-rh=true>Profiling · React Native</title><meta data-rh=true name=viewport content="width=device-width, initial-scale=1.0"><meta data-rh=true property=og:url content=https://reactnative.dev/docs/profiling><meta data-rh=true property=og:locale content=en><meta data-rh=true name=docusaurus_locale content=en><meta data-rh=true name=docsearch:language content=en><meta data-rh=true property=og:image content=https://reactnative.dev/img/logo-share.png><meta data-rh=true name=twitter:card content=summary_large_image><meta data-rh=true name=twitter:image content=https://reactnative.dev/img/logo-share.png><meta data-rh=true name=twitter:site content=@reactnative><meta data-rh=true name=docusaurus_version content=0.79><meta data-rh=true name=docusaurus_tag content=docs-default-0.79><meta data-rh=true name=docsearch:version content=0.79><meta data-rh=true name=docsearch:docusaurus_tag content=docs-default-0.79><meta data-rh=true property=og:title content="Profiling · React Native"><meta data-rh=true name=description content="Profiling is the process of analyzing an app's performance, resource usage, and behavior to identify potential bottlenecks or inefficiencies. It's worth making use of profiling tools to ensure your app works smoothly across different devices and conditions."><meta data-rh=true property=og:description content="Profiling is the process of analyzing an app's performance, resource usage, and behavior to identify potential bottlenecks or inefficiencies. It's worth making use of profiling tools to ensure your app works smoothly across different devices and conditions."><link data-rh=true rel=icon href=/img/favicon.ico><link data-rh=true rel=canonical href=https://reactnative.dev/docs/profiling><link data-rh=true rel=alternate href=https://reactnative.dev/docs/profiling hreflang=en><link data-rh=true rel=alternate href=https://reactnative.dev/docs/profiling hreflang=x-default><link data-rh=true rel=preconnect href=https://8TDSE0OHGQ-dsn.algolia.net crossorigin=anonymous><link rel=alternate type=application/rss+xml href=/blog/rss.xml title="React Native RSS Feed"><link rel=alternate type=application/atom+xml href=/blog/atom.xml title="React Native Atom Feed"><link rel=alternate type=application/json href=/blog/feed.json title="React Native JSON Feed"><link rel=preconnect href=https://www.google-analytics.com><script>window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)},ga.l=+new Date,ga("create","UA-41298772-2","auto"),ga("send","pageview")</script><script async src=https://www.google-analytics.com/analytics.js></script><link rel=preconnect href=https://www.google-analytics.com><link rel=preconnect href=https://www.googletagmanager.com><script async src="https://www.googletagmanager.com/gtag/js?id=G-58L13S6BDP"></script><script>function gtag(){dataLayer.push(arguments)}window.dataLayer=window.dataLayer||[],gtag("js",new Date),gtag("config","G-58L13S6BDP",{})</script><link rel=search type=application/opensearchdescription+xml title="React Native" href=/opensearch.xml><link rel=icon href=/img/pwa/manifest-icon-512.png><link rel=manifest href=/manifest.json><meta name=theme-color content=#20232a><meta name=apple-mobile-web-app-capable content=yes><meta name=apple-mobile-web-app-status-bar-style content=#20232a><link rel=apple-touch-icon href=/img/pwa/manifest-icon-512.png><link rel=mask-icon href=/img/pwa/manifest-icon-512.png color=#06bcee><meta name=msapplication-TileImage href=/img/pwa/manifest-icon-512.png><meta name=msapplication-TileColor content=#20232a><script src=https://cdn.jsdelivr.net/npm/focus-visible@5.2.0/dist/focus-visible.min.js defer></script><script src=https://widget.surveymonkey.com/collect/website/js/tRaiETqnLgj758hTBazgd8ryO5qrZo8Exadq9qmt1wtm4_2FdZGEAKHDFEt_2BBlwwM4.js defer></script><script src=https://snack.expo.dev/embed.js defer></script><script src=https://platform.twitter.com/widgets.js async></script><link rel=stylesheet href=/assets/css/styles.883cb042.css><script src=/assets/js/runtime~main.8ac1e6f0.js defer></script><script src=/assets/js/main.341783f5.js defer></script><body class=navigation-with-keyboard><svg xmlns=http://www.w3.org/2000/svg style="display: none;"><defs>
2<symbol id=theme-svg-external-link viewBox="0 0 24 24"><path fill=currentColor d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"/></symbol>
3</defs></svg>
4<script>!function(){var t=function(){try{return new URLSearchParams(window.location.search).get("docusaurus-theme")}catch(t){}}()||function(){try{return window.localStorage.getItem("theme")}catch(t){}}();document.documentElement.setAttribute("data-theme",t||(window.matchMedia("(prefers-color-scheme: dark)").matches?"dark":"light")),document.documentElement.setAttribute("data-theme-choice",t||"system")}(),function(){try{for(var[t,e]of new URLSearchParams(window.location.search).entries())if(t.startsWith("docusaurus-data-")){var a=t.replace("docusaurus-data-","data-");document.documentElement.setAttribute(a,e)}}catch(t){}}(),document.documentElement.setAttribute("data-announcement-bar-initially-dismissed",function(){try{return"true"===localStorage.getItem("docusaurus.announcement.dismiss")}catch(t){}return!1}())</script><div id=__docusaurus><div role=region aria-label="Skip to main content"><a class=skipToContent_oPtH href=#__docusaurus_skipToContent_fallback>Skip to main content</a></div><div class="theme-announcement-bar announcementBar_zJRd" style=background-color:#20232a;color:#fff role=banner><div class="content_bSb_ announcementBarContent_t7IR">Join us for React Conf on Oct 7-8. <a target=_blank rel="noopener noreferrer" href=https://conf.react.dev>Learn more</a>.</div></div><nav aria-label=Main class="theme-layout-navbar navbar navbar--fixed-top navbar--dark"><div class=navbar__inner><div class="theme-layout-navbar-left navbar__items"><button aria-label="Toggle navigation bar" aria-expanded=false class="navbar__toggle clean-btn" type=button><svg width=30 height=30 viewBox="0 0 30 30" aria-hidden=true><path stroke=currentColor stroke-linecap=round stroke-miterlimit=10 stroke-width=2 d="M4 7h22M4 15h22M4 23h22"/></svg></button><a class=navbar__brand href=/><div class=navbar__logo><img src=/img/header_logo.svg alt="React Native" class="themedComponent_siVc themedComponent--light_hHel"><img src=/img/header_logo.svg alt="React Native" class="themedComponent_siVc themedComponent--dark_yETr"></div><b class="navbar__title text--truncate">React Native</b></a><div class="navbar__item dropdown dropdown--hoverable"><a class=navbar__link aria-haspopup=true aria-expanded=false role=button href=/docs/profiling>0.79</a><ul class=dropdown__menu><li><a class=dropdown__link href=/docs/next/profiling>Next</a><li><a aria-current=page class="dropdown__link dropdown__link--active" href=/docs/profiling>0.79</a><li><a class=dropdown__link href=/docs/0.78/profiling>0.78</a><li><a class=dropdown__link href=/docs/0.77/profiling>0.77</a><li><a class=dropdown__link href=/docs/0.76/profiling>0.76</a><li><a class=dropdown__link href=/docs/0.75/profiling>0.75</a><li><a class=dropdown__link href=/docs/0.74/profiling>0.74</a><li><a class=dropdown__link href=/docs/0.73/profiling>0.73</a><li><a class=dropdown__link href=/docs/0.72/profiling>0.72</a><li><a class=dropdown__link href=/docs/0.71/profiling>0.71</a><li><a class=dropdown__link href=/docs/0.70/profiling>0.70</a><li><a class=dropdown__link href=/versions>All versions</a></ul></div></div><div class="theme-layout-navbar-right navbar__items navbar__items--right"><div class="navbar__item dropdown dropdown--hoverable dropdown--right"><a href=# aria-haspopup=true aria-expanded=false role=button class=navbar__link>Development</a><ul class=dropdown__menu><li><a aria-current=page class="dropdown__link dropdown__link--active" href=/docs/getting-started>Guides</a><li><a class=dropdown__link href=/docs/components-and-apis>Components</a><li><a class=dropdown__link href=/docs/accessibilityinfo>APIs</a><li><a class=dropdown__link href=/architecture/overview>Architecture</a></ul></div><a class="navbar__item navbar__link" href=/contributing/overview>Contributing</a><a class="navbar__item navbar__link" href=/community/overview>Community</a><a class="navbar__item navbar__link" href=/showcase>Showcase</a><a class="navbar__item navbar__link" href=/blog>Blog</a><a href=https://github.com/facebook/react-native target=_blank rel="noopener noreferrer" class="navbar__item navbar__link navbar-github-link" aria-label="GitHub repository"></a><div class="toggle_ki11 colorModeToggle_Hewu"><button class="clean-btn toggleButton_MMFG toggleButtonDisabled_Uw7m darkNavbarColorModeToggle_m8pZ" type=button disabled title="system mode" aria-label="Switch between dark and light mode (currently system mode)"><svg viewBox="0 0 24 24" width=24 height=24 aria-hidden=true class="toggleIcon_k9hJ lightToggleIcon_lgto"><path fill=currentColor d="M12,9c1.65,0,3,1.35,3,3s-1.35,3-3,3s-3-1.35-3-3S10.35,9,12,9 M12,7c-2.76,0-5,2.24-5,5s2.24,5,5,5s5-2.24,5-5 S14.76,7,12,7L12,7z M2,13l2,0c0.55,0,1-0.45,1-1s-0.45-1-1-1l-2,0c-0.55,0-1,0.45-1,1S1.45,13,2,13z M20,13l2,0c0.55,0,1-0.45,1-1 s-0.45-1-1-1l-2,0c-0.55,0-1,0.45-1,1S19.45,13,20,13z M11,2v2c0,0.55,0.45,1,1,1s1-0.45,1-1V2c0-0.55-0.45-1-1-1S11,1.45,11,2z M11,20v2c0,0.55,0.45,1,1,1s1-0.45,1-1v-2c0-0.55-0.45-1-1-1C11.45,19,11,19.45,11,20z M5.99,4.58c-0.39-0.39-1.03-0.39-1.41,0 c-0.39,0.39-0.39,1.03,0,1.41l1.06,1.06c0.39,0.39,1.03,0.39,1.41,0s0.39-1.03,0-1.41L5.99,4.58z M18.36,16.95 c-0.39-0.39-1.03-0.39-1.41,0c-0.39,0.39-0.39,1.03,0,1.41l1.06,1.06c0.39,0.39,1.03,0.39,1.41,0c0.39-0.39,0.39-1.03,0-1.41 L18.36,16.95z M19.42,5.99c0.39-0.39,0.39-1.03,0-1.41c-0.39-0.39-1.03-0.39-1.41,0l-1.06,1.06c-0.39,0.39-0.39,1.03,0,1.41 s1.03,0.39,1.41,0L19.42,5.99z M7.05,18.36c0.39-0.39,0.39-1.03,0-1.41c-0.39-0.39-1.03-0.39-1.41,0l-1.06,1.06 c-0.39,0.39-0.39,1.03,0,1.41s1.03,0.39,1.41,0L7.05,18.36z"/></svg><svg viewBox="0 0 24 24" width=24 height=24 aria-hidden=true class="toggleIcon_k9hJ darkToggleIcon_U96C"><path fill=currentColor d="M9.37,5.51C9.19,6.15,9.1,6.82,9.1,7.5c0,4.08,3.32,7.4,7.4,7.4c0.68,0,1.35-0.09,1.99-0.27C17.45,17.19,14.93,19,12,19 c-3.86,0-7-3.14-7-7C5,9.07,6.81,6.55,9.37,5.51z M12,3c-4.97,0-9,4.03-9,9s4.03,9,9,9s9-4.03,9-9c0-0.46-0.04-0.92-0.1-1.36 c-0.98,1.37-2.58,2.26-4.4,2.26c-2.98,0-5.4-2.42-5.4-5.4c0-1.81,0.89-3.42,2.26-4.4C12.92,3.04,12.46,3,12,3L12,3z"/></svg><svg viewBox="0 0 24 24" width=24 height=24 aria-hidden=true class="toggleIcon_k9hJ systemToggleIcon_E5c0"><path fill=currentColor d="m12 21c4.971 0 9-4.029 9-9s-4.029-9-9-9-9 4.029-9 9 4.029 9 9 9zm4.95-13.95c1.313 1.313 2.05 3.093 2.05 4.95s-0.738 3.637-2.05 4.95c-1.313 1.313-3.093 2.05-4.95 2.05v-14c1.857 0 3.637 0.737 4.95 2.05z"/></svg></button></div><div class=navbarSearchContainer_bzqh><button type=button class="DocSearch DocSearch-Button" aria-label="Search (Command+K)"><span class=DocSearch-Button-Container><svg width=20 height=20 class=DocSearch-Search-Icon viewBox="0 0 20 20" aria-hidden=true><path d="M14.386 14.386l4.0877 4.0877-4.0877-4.0877c-2.9418 2.9419-7.7115 2.9419-10.6533 0-2.9419-2.9418-2.9419-7.7115 0-10.6533 2.9418-2.9419 7.7115-2.9419 10.6533 0 2.9419 2.9418 2.9419 7.7115 0 10.6533z" stroke=currentColor fill=none fill-rule=evenodd stroke-linecap=round stroke-linejoin=round /></svg><span class=DocSearch-Button-Placeholder>Search</span></span><span class=DocSearch-Button-Keys></span></button></div></div></div><div role=presentation class=navbar-sidebar__backdrop></div></nav><div id=__docusaurus_skipToContent_fallback class="theme-layout-main main-wrapper mainWrapper_MB5r"><div class=docsWrapper__sE8><button aria-label="Scroll back to top" class="clean-btn theme-back-to-top-button backToTopButton_iEvu" type=button></button><div class=docRoot_DfVB><aside class="theme-doc-sidebar-container docSidebarContainer_c7NB"><div class=sidebarViewport_KYo0><div class=sidebar_CUen><nav aria-label="Docs sidebar" class="menu thin-scrollbar menu_jmj1 menuWithAnnouncementBar_YufC"><ul class="theme-doc-sidebar-menu menu__list"><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="menu__link menu__link--sublist menu__link--sublist-caret" role=button aria-expanded=false href=/docs/getting-started>The Basics</a></div><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="menu__link menu__link--sublist menu__link--sublist-caret" role=button aria-expanded=false href=/docs/environment-setup>Environment setup</a></div><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="menu__link menu__link--sublist menu__link--sublist-caret" role=button aria-expanded=false href=/docs/running-on-device>Workflow</a></div><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="menu__link menu__link--sublist menu__link--sublist-caret" role=button aria-expanded=false href=/docs/style>UI & Interaction</a></div><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="menu__link menu__link--sublist menu__link--sublist-caret" role=button aria-expanded=false href=/docs/debugging>Debugging</a></div><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="menu__link menu__link--sublist menu__link--sublist-caret" role=button aria-expanded=false href=/docs/testing-overview>Testing</a></div><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item"><div class=menu__list-item-collapsible><a class="menu__link menu__link--sublist menu__link--sublist-caret menu__link--active" role=button aria-expanded=true href=/docs/performance>Performance</a></div><ul class=menu__list><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class=menu__link tabindex=0 href=/docs/performance>Performance Overview</a><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class=menu__link tabindex=0 href=/docs/build-speed>Speeding up your Build phase</a><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class=menu__link tabindex=0 href=/docs/optimizing-flatlist-configuration>Optimizing Flatlist Configuration</a><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class=menu__link tabindex=0 href=/docs/optimizing-javascript-loading>Optimizing JavaScript loading</a><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link menu__link--active" aria-current=page tabindex=0 href=/docs/profiling>Profiling</a></ul><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="menu__link menu__link--sublist menu__link--sublist-caret" role=button aria-expanded=false href=/docs/javascript-environment>JavaScript Runtime</a></div><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="menu__link menu__link--sublist menu__link--sublist-caret" role=button aria-expanded=false href=/docs/the-new-architecture/what-is-codegen>Codegen</a></div><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="menu__link menu__link--sublist menu__link--sublist-caret" role=button aria-expanded=false href=/docs/native-platform>Native Development</a></div><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="menu__link menu__link--sublist menu__link--sublist-caret" role=button aria-expanded=false href=/docs/headless-js-android>Android and iOS guides</a></div><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="menu__link menu__link--sublist menu__link--sublist-caret" role=button aria-expanded=false href=/docs/legacy/native-modules-intro>Legacy Architecture</a></div></ul></nav></div></div></aside><main class=docMainContainer_a9sJ><div class="container padding-top--md padding-bottom--lg"><div class=row><div class="col docItemCol_Qr34"><div class=docItemContainer_tjFy><article><div class="tocCollapsible_wXna theme-doc-toc-mobile tocMobile_Ojys"><button type=button class="clean-btn tocCollapsibleButton_iI2p">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Profiling</h1></header><p>Profiling is the process of analyzing an app's performance, resource usage, and behavior to identify potential bottlenecks or inefficiencies. It's worth making use of profiling tools to ensure your app works smoothly across different devices and conditions.</p>
5<p>For iOS, Instruments is an invaluable tool, and on Android you should learn to use the <a href=/docs/profiling#profiling-android-ui-performance-with-system-tracing>Android Studio Profiler</a>.</p>
6<p>But first, <a href=/docs/performance#running-in-development-mode-devtrue><strong>make sure that Development Mode is OFF!</strong></a> You should see <code>__DEV__ === false, development-level warning are OFF, performance optimizations are ON</code> in your application logs.</p>
7<h2 class="anchor anchorWithStickyNavbar_JmGV" id=profiling-android-ui-performance-with-system-tracing>Profiling Android UI Performance with System Tracing<a href=#profiling-android-ui-performance-with-system-tracing class=hash-link aria-label="Direct link to Profiling Android UI Performance with System Tracing" title="Direct link to Profiling Android UI Performance with System Tracing"></a></h2>
8<p>Android supports 10k+ different phones and is generalized to support software rendering: the framework architecture and need to generalize across many hardware targets unfortunately means you get less for free relative to iOS. But sometimes, there are things you can improve -- and many times it's not native code's fault at all!</p>
9<p>The first step for debugging this jank is to answer the fundamental question of where your time is being spent during each 16ms frame. For that, we'll be using the <a href=https://developer.android.com/studio/profile target=_blank rel="noopener noreferrer">built-in System Tracing profiler in the Android Studio</a>.</p>
10<h3 class="anchor anchorWithStickyNavbar_JmGV" id=1-collecting-a-trace>1. Collecting a trace<a href=#1-collecting-a-trace class=hash-link aria-label="Direct link to 1. Collecting a trace" title="Direct link to 1. Collecting a trace"></a></h3>
11<p>First, connect a device that exhibits the stuttering you want to investigate to your computer via USB. Open your project's <code>android</code> folder in Android Studio, select your device in the top right pane, and <a href=https://developer.android.com/studio/profile#build-and-run target=_blank rel="noopener noreferrer">run your project as profileable</a>.</p>
12<p>When your app is built as profileable and is running on the device, get your app to the point right before the navigation/animation you want to profile and start the <a href=https://developer.android.com/studio/profile#start-profiling target=_blank rel="noopener noreferrer">"Capture System Activities" task</a> in the Android Studio Profiler pane.</p>
13<p>Once the trace starts collecting, perform the animation or interaction you care about. Then press "Stop recording". You can now <a href=https://developer.android.com/studio/profile/jank-detection target=_blank rel="noopener noreferrer">inspect the trace directly in the Android Studio</a>. Alternatively, you can select it in the "Past Recordings" pane, press "Export recording", and open it in a tool like <a href=https://perfetto.dev/ target=_blank rel="noopener noreferrer">Perfetto</a>.</p>
14<h3 class="anchor anchorWithStickyNavbar_JmGV" id=2-reading-the-trace>2. Reading the trace<a href=#2-reading-the-trace class=hash-link aria-label="Direct link to 2. Reading the trace" title="Direct link to 2. Reading the trace"></a></h3>
15<p>After opening the trace in Android Studio or Perfetto, you should see something like this:</p>
16<p><img decoding=async loading=lazy alt=Example src=/assets/images/SystraceExample-05b3ea44681d0291c1040e5f655fcd95.png width=613 height=404 class=img_SS3x></p>
17<div class="theme-admonition theme-admonition-note admonition_WCGJ alert alert--secondary"><div class=admonitionHeading_GCBg><span class=admonitionIcon_L39b><svg viewBox="0 0 14 16"><path fill-rule=evenodd d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"/></svg></span>Hint</div><div class=admonitionContent_pbrs><p>Use the WASD keys to strafe and zoom.</div></div>
18<p>The exact UI might be different but the instructions below will apply regardless of the tool you're using.</p>
19<div class="theme-admonition theme-admonition-info admonition_WCGJ alert alert--info"><div class=admonitionHeading_GCBg><span class=admonitionIcon_L39b><svg viewBox="0 0 14 16"><path fill-rule=evenodd d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"/></svg></span>Enable VSync highlighting</div><div class=admonitionContent_pbrs><p>Check this checkbox at the top right of the screen to highlight the 16ms frame boundaries:<p><img decoding=async loading=lazy alt="Enable VSync Highlighting" src="data:image/png;base64,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" width=132 height=48 class=img_SS3x><p>You should see zebra stripes as in the screenshot above. If you don't, try profiling on a different device: Samsung has been known to have issues displaying vsyncs while the Nexus series is generally pretty reliable.</div></div>
20<h3 class="anchor anchorWithStickyNavbar_JmGV" id=3-find-your-process>3. Find your process<a href=#3-find-your-process class=hash-link aria-label="Direct link to 3. Find your process" title="Direct link to 3. Find your process"></a></h3>
21<p>Scroll until you see (part of) the name of your package. In this case, I was profiling <code>com.facebook.adsmanager</code>, which shows up as <code>book.adsmanager</code> because of silly thread name limits in the kernel.</p>
22<p>On the left side, you'll see a set of threads which correspond to the timeline rows on the right. There are a few threads we care about for our purposes: the UI thread (which has your package name or the name UI Thread), <code>mqt_js</code>, and <code>mqt_native_modules</code>. If you're running on Android 5+, we also care about the Render Thread.</p>
23<ul>
24<li>
25<p><strong>UI Thread.</strong> This is where standard android measure/layout/draw happens. The thread name on the right will be your package name (in my case book.adsmanager) or UI Thread. The events that you see on this thread should look something like this and have to do with <code>Choreographer</code>, <code>traversals</code>, and <code>DispatchUI</code>:</p>
26<p><img decoding=async loading=lazy alt="UI Thread Example" src="data:image/png;base64,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" width=223 height=114 class=img_SS3x></p>
27</li>
28<li>
29<p><strong>JS Thread.</strong> This is where JavaScript is executed. The thread name will be either <code>mqt_js</code> or <code><...></code> depending on how cooperative the kernel on your device is being. To identify it if it doesn't have a name, look for things like <code>JSCall</code>, <code>Bridge.executeJSCall</code>, etc:</p>
30<p><img decoding=async loading=lazy alt="JS Thread Example" src="data:image/png;base64,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" width=295 height=79 class=img_SS3x></p>
31</li>
32<li>
33<p><strong>Native Modules Thread.</strong> This is where native module calls (e.g. the <code>UIManager</code>) are executed. The thread name will be either <code>mqt_native_modules</code> or <code><...></code>. To identify it in the latter case, look for things like <code>NativeCall</code>, <code>callJavaModuleMethod</code>, and <code>onBatchComplete</code>:</p>
34<p><img decoding=async loading=lazy alt="Native Modules Thread Example" src="data:image/png;base64,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" width=560 height=90 class=img_SS3x></p>
35</li>
36<li>
37<p><strong>Bonus: Render Thread.</strong> If you're using Android L (5.0) and up, you will also have a render thread in your application. This thread generates the actual OpenGL commands used to draw your UI. The thread name will be either <code>RenderThread</code> or <code><...></code>. To identify it in the latter case, look for things like <code>DrawFrame</code> and <code>queueBuffer</code>:</p>
38<p><img decoding=async loading=lazy alt="Render Thread Example" src=data:image/png;base64,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 width=597 height=83 class=img_SS3x></p>
39</li>
40</ul>
41<h2 class="anchor anchorWithStickyNavbar_JmGV" id=identifying-a-culprit>Identifying a culprit<a href=#identifying-a-culprit class=hash-link aria-label="Direct link to Identifying a culprit" title="Direct link to Identifying a culprit"></a></h2>
42<p>A smooth animation should look something like the following:</p>
43<p><img decoding=async loading=lazy alt="Smooth Animation" src=/assets/images/SystraceWellBehaved-82dfa037cb9e1d29d7daae2d6dba2ffc.png width=654 height=409 class=img_SS3x></p>
44<p>Each change in color is a frame -- remember that in order to display a frame, all our UI work needs to be done by the end of that 16ms period. Notice that no thread is working close to the frame boundary. An application rendering like this is rendering at 60 FPS.</p>
45<p>If you noticed chop, however, you might see something like this:</p>
46<p><img decoding=async loading=lazy alt="Choppy Animation from JS" src=/assets/images/SystraceBadJS-b8518ae5e520b074ccc7722fcf30b7ed.png width=627 height=298 class=img_SS3x></p>
47<p>Notice that the JS thread is executing almost all the time, and across frame boundaries! This app is not rendering at 60 FPS. In this case, <strong>the problem lies in JS</strong>.</p>
48<p>You might also see something like this:</p>
49<p><img decoding=async loading=lazy alt="Choppy Animation from UI" src=/assets/images/SystraceBadUI-cc4bb271e7a568efc7933d1c6f453d67.png width=839 height=216 class=img_SS3x></p>
50<p>In this case, the UI and render threads are the ones that have work crossing frame boundaries. The UI that we're trying to render on each frame is requiring too much work to be done. In this case, <strong>the problem lies in the native views being rendered</strong>.</p>
51<p>At this point, you'll have some very helpful information to inform your next steps.</p>
52<h2 class="anchor anchorWithStickyNavbar_JmGV" id=resolving-javascript-issues>Resolving JavaScript issues<a href=#resolving-javascript-issues class=hash-link aria-label="Direct link to Resolving JavaScript issues" title="Direct link to Resolving JavaScript issues"></a></h2>
53<p>If you identified a JS problem, look for clues in the specific JS that you're executing. In the scenario above, we see <code>RCTEventEmitter</code> being called multiple times per frame. Here's a zoom-in of the JS thread from the trace above:</p>
54<p><img decoding=async loading=lazy alt="Too much JS" src=/assets/images/SystraceBadJS2-f454f409a22625f659d465abdab06ce0.png width=679 height=114 class=img_SS3x></p>
55<p>This doesn't seem right. Why is it being called so often? Are they actually different events? The answers to these questions will probably depend on your product code. And many times, you'll want to look into <a href=https://reactjs.org/docs/react-component.html#shouldcomponentupdate target=_blank rel="noopener noreferrer">shouldComponentUpdate</a>.</p>
56<h2 class="anchor anchorWithStickyNavbar_JmGV" id=resolving-native-ui-issues>Resolving native UI Issues<a href=#resolving-native-ui-issues class=hash-link aria-label="Direct link to Resolving native UI Issues" title="Direct link to Resolving native UI Issues"></a></h2>
57<p>If you identified a native UI problem, there are usually two scenarios:</p>
58<ol>
59<li>the UI you're trying to draw each frame involves too much work on the GPU, or</li>
60<li>You're constructing new UI during the animation/interaction (e.g. loading in new content during a scroll).</li>
61</ol>
62<h3 class="anchor anchorWithStickyNavbar_JmGV" id=too-much-gpu-work>Too much GPU work<a href=#too-much-gpu-work class=hash-link aria-label="Direct link to Too much GPU work" title="Direct link to Too much GPU work"></a></h3>
63<p>In the first scenario, you'll see a trace that has the UI thread and/or Render Thread looking like this:</p>
64<p><img decoding=async loading=lazy alt="Overloaded GPU" src=/assets/images/SystraceBadUI-cc4bb271e7a568efc7933d1c6f453d67.png width=839 height=216 class=img_SS3x></p>
65<p>Notice the long amount of time spent in <code>DrawFrame</code> that crosses frame boundaries. This is time spent waiting for the GPU to drain its command buffer from the previous frame.</p>
66<p>To mitigate this, you should:</p>
67<ul>
68<li>investigate using <code>renderToHardwareTextureAndroid</code> for complex, static content that is being animated/transformed (e.g. the <code>Navigator</code> slide/alpha animations)</li>
69<li>make sure that you are <strong>not</strong> using <code>needsOffscreenAlphaCompositing</code>, which is disabled by default, as it greatly increases the per-frame load on the GPU in most cases.</li>
70</ul>
71<h3 class="anchor anchorWithStickyNavbar_JmGV" id=creating-new-views-on-the-ui-thread>Creating new views on the UI thread<a href=#creating-new-views-on-the-ui-thread class=hash-link aria-label="Direct link to Creating new views on the UI thread" title="Direct link to Creating new views on the UI thread"></a></h3>
72<p>In the second scenario, you'll see something more like this:</p>
73<p><img decoding=async loading=lazy alt="Creating Views" src=/assets/images/SystraceBadCreateUI-fc9d228fc136be3574c0c5805ac0d7b5.png width=772 height=270 class=img_SS3x></p>
74<p>Notice that first the JS thread thinks for a bit, then you see some work done on the native modules thread, followed by an expensive traversal on the UI thread.</p>
75<p>There isn't a quick way to mitigate this unless you're able to postpone creating new UI until after the interaction, or you are able to simplify the UI you're creating. The react native team is working on an infrastructure level solution for this that will allow new UI to be created and configured off the main thread, allowing the interaction to continue smoothly.</p>
76<h3 class="anchor anchorWithStickyNavbar_JmGV" id=finding-native-cpu-hotspots>Finding native CPU hotspots<a href=#finding-native-cpu-hotspots class=hash-link aria-label="Direct link to Finding native CPU hotspots" title="Direct link to Finding native CPU hotspots"></a></h3>
77<p>If the problem seems to be on the native side, you can use the <a href=https://developer.android.com/studio/profile/record-java-kotlin-methods target=_blank rel="noopener noreferrer">CPU hotspot profiler</a> to get more details on what's happening. Open the Android Studio Profiler panel and select "Find CPU Hotspots (Java/Kotlin Method Recording)".</p>
78<div class="theme-admonition theme-admonition-info admonition_WCGJ alert alert--info"><div class=admonitionHeading_GCBg><span class=admonitionIcon_L39b><svg viewBox="0 0 14 16"><path fill-rule=evenodd d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"/></svg></span>Choose the Java/Kotlin recording</div><div class=admonitionContent_pbrs><p>Make sure you select "Find CPU Hotspots <strong>(Java/Kotlin Recording)</strong>" rather than "Find CPU Hotspots (Callstack Sample)". They have similar icons but do different things.</div></div>
79<p>Perform the interactions and press "Stop recording". Recording is resource-intensive, so keep the interaction short. You can then either inspect the resulting trace in the Android Studio or export it and open it in an online tool like <a href=https://profiler.firefox.com/ target=_blank rel="noopener noreferrer">Firefox Profiler</a>.</p>
80<p>Unlike System Trace, CPU hotspot profiling is slow so it won't give you accurate measurements. However, it should give you an idea of what native methods are being called, and where the time is being spent proportionally during each frame.</div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class=editButtons_t0bR><a href=https://github.com/facebook/react-native-website/edit/main/docs/profiling.md target=_blank rel="noopener noreferrer" class=theme-edit-this-page><svg fill=currentColor height=20 width=20 viewBox="0 0 40 40" class=iconEdit_bHB7 aria-hidden=true><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"/></g></svg>Edit page for next release</a><a href=https://github.com/facebook/react-native-website/edit/main/website/versioned_docs/version-0.79/profiling.md target=_blank rel="noopener noreferrer" class=theme-edit-this-page><svg fill=currentColor height=20 width=20 viewBox="0 0 40 40" class=iconEdit_bHB7 aria-hidden=true><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"/></g></svg>Edit page for current release</a></div><div class=lastUpdated_VsjB><span class=theme-last-updated>Last updated<!-- --> on <b><time datetime=2025-04-14T14:14:17.000Z itemprop=dateModified>Apr 14, 2025</time></b></span></div></div></footer></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href=/docs/optimizing-javascript-loading><div class=pagination-nav__sublabel>Previous</div><div class=pagination-nav__label>Optimizing JavaScript loading</div></a><a class="pagination-nav__link pagination-nav__link--next" href=/docs/javascript-environment><div class=pagination-nav__sublabel>Next</div><div class=pagination-nav__label>JavaScript Environment</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_XG6w thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href=#profiling-android-ui-performance-with-system-tracing class="table-of-contents__link toc-highlight">Profiling Android UI Performance with System Tracing</a><ul><li><a href=#1-collecting-a-trace class="table-of-contents__link toc-highlight">1. Collecting a trace</a><li><a href=#2-reading-the-trace class="table-of-contents__link toc-highlight">2. Reading the trace</a><li><a href=#3-find-your-process class="table-of-contents__link toc-highlight">3. Find your process</a></ul><li><a href=#identifying-a-culprit class="table-of-contents__link toc-highlight">Identifying a culprit</a><li><a href=#resolving-javascript-issues class="table-of-contents__link toc-highlight">Resolving JavaScript issues</a><li><a href=#resolving-native-ui-issues class="table-of-contents__link toc-highlight">Resolving native UI Issues</a><ul><li><a href=#too-much-gpu-work class="table-of-contents__link toc-highlight">Too much GPU work</a><li><a href=#creating-new-views-on-the-ui-thread class="table-of-contents__link toc-highlight">Creating new views on the UI thread</a><li><a href=#finding-native-cpu-hotspots class="table-of-contents__link toc-highlight">Finding native CPU hotspots</a></ul></ul></div></div></div></div></main></div></div></div><footer class="theme-layout-footer footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="theme-layout-footer-column col footer__col"><div class=footer__title>Develop</div><ul class="footer__items clean-list"><li class=footer__item><a class=footer__link-item href=/docs/getting-started>Guides</a><li class=footer__item><a class=footer__link-item href=/docs/components-and-apis>Components</a><li class=footer__item><a class=footer__link-item href=/docs/accessibilityinfo>APIs</a><li class=footer__item><a class=footer__link-item href=/architecture/overview>Architecture</a></ul></div><div class="theme-layout-footer-column col footer__col"><div class=footer__title>Participate</div><ul class="footer__items clean-list"><li class=footer__item><a class=footer__link-item href=/showcase>Showcase</a><li class=footer__item><a class=footer__link-item href=/contributing/overview>Contributing</a><li class=footer__item><a class=footer__link-item href=/community/overview>Community</a><li class=footer__item><a href=https://reactnative.directory/ target=_blank rel="noopener noreferrer" class=footer__link-item>Directory<svg width=13.5 height=13.5 aria-hidden=true viewBox="0 0 24 24" class=iconExternalLink_2l9O><path fill=currentColor d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"/></svg></a><li class=footer__item><a href=https://stackoverflow.com/questions/tagged/react-native target=_blank rel="noopener noreferrer" class=footer__link-item>Stack Overflow<svg width=13.5 height=13.5 aria-hidden=true viewBox="0 0 24 24" class=iconExternalLink_2l9O><path fill=currentColor d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"/></svg></a></ul></div><div class="theme-layout-footer-column col footer__col"><div class=footer__title>Find us</div><ul class="footer__items clean-list"><li class=footer__item><a class=footer__link-item href=/blog>Blog</a><li class=footer__item><a href=https://x.com/reactnative target=_blank rel="noopener noreferrer" class=footer__link-item>X<svg width=13.5 height=13.5 aria-hidden=true viewBox="0 0 24 24" class=iconExternalLink_2l9O><path fill=currentColor d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"/></svg></a><li class=footer__item><a href=https://bsky.app/profile/reactnative.dev target=_blank rel="noopener noreferrer" class=footer__link-item>Bluesky<svg width=13.5 height=13.5 aria-hidden=true viewBox="0 0 24 24" class=iconExternalLink_2l9O><path fill=currentColor d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"/></svg></a><li class=footer__item><a href=https://github.com/facebook/react-native target=_blank rel="noopener noreferrer" class=footer__link-item>GitHub<svg width=13.5 height=13.5 aria-hidden=true viewBox="0 0 24 24" class=iconExternalLink_2l9O><path fill=currentColor d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"/></svg></a></ul></div><div class="theme-layout-footer-column col footer__col"><div class=footer__title>Explore More</div><ul class="footer__items clean-list"><li class=footer__item><a href=https://react.dev/ target=_blank rel="noopener noreferrer" class=footer__link-item>ReactJS<svg width=13.5 height=13.5 aria-hidden=true viewBox="0 0 24 24" class=iconExternalLink_2l9O><path fill=currentColor d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"/></svg></a><li class=footer__item><a href=https://opensource.fb.com/legal/privacy/ target=_blank rel="noopener noreferrer" class=footer__link-item>Privacy Policy<svg width=13.5 height=13.5 aria-hidden=true viewBox="0 0 24 24" class=iconExternalLink_2l9O><path fill=currentColor d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"/></svg></a><li class=footer__item><a href=https://opensource.fb.com/legal/terms/ target=_blank rel="noopener noreferrer" class=footer__link-item>Terms of Service<svg width=13.5 height=13.5 aria-hidden=true viewBox="0 0 24 24" class=iconExternalLink_2l9O><path fill=currentColor d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"/></svg></a></ul></div></div><div class="footer__bottom text--center"><div class=margin-bottom--sm><a href=https://opensource.fb.com/ rel="noopener noreferrer" class=footerLogoLink_tutC><img src=/img/oss_logo.svg alt="Meta Open Source Logo" class="footer__logo themedComponent_siVc themedComponent--light_hHel"><img src=/img/oss_logo.svg alt="Meta Open Source Logo" class="footer__logo themedComponent_siVc themedComponent--dark_yETr"></a></div><div class=footer__copyright>Copyright © 2025 Meta Platforms, Inc.</div></div></div></footer></div>