{"id":28740,"date":"2023-06-02T11:39:39","date_gmt":"2023-06-02T11:39:39","guid":{"rendered":"https:\/\/www.confianzit.com\/cit-blog\/?p=28740"},"modified":"2023-06-05T08:10:52","modified_gmt":"2023-06-05T08:10:52","slug":"7-tips-for-optimizing-performance-in-reactjs","status":"publish","type":"post","link":"https:\/\/www.confianzit.com\/cit-blog\/7-tips-for-optimizing-performance-in-reactjs\/","title":{"rendered":"7 Tips for Optimizing Performance in ReactJS"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_row column_structure=&#8221;3_5,2_5&#8243; _builder_version=&#8221;4.21.0&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;3_5&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text module_class=&#8221;blog-left-content&#8221; _builder_version=&#8221;4.21.0&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<p><a href=\"https:\/\/www.confianzit.com\/cit-blog\/best-practices-for-developing-with-reactjs\/\"><span style=\"font-weight: 400;\">ReactJS<\/span><\/a><span style=\"font-weight: 400;\"> (React or React.js) is a JavaScript library created by Meta (formerly Facebook) in 2011. It\u2019s now free and open-source as of 2013, and it\u2019s now on its 18th version.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Because of its simplicity and ease of use, React is an extremely popular library and is one of the most used libraries today. However, it&#8217;s generally optimized for more straightforward projects and can suffer from slow performance and lag with more complicated programs.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">However, that doesn&#8217;t mean you can&#8217;t use it for your project; you&#8217;ll just have to optimize your work along the way. So follow these seven tips to boost your application&#8217;s performance while using ReactJS.<\/span><\/p>\n<p><center><img decoding=\"async\" src=\"http:\/\/www.confianzit.com\/cit-blog\/wp-content\/uploads\/2023\/06\/7-Tips-for-Optimizing-Performance-in-ReactJS-2-1.jpg\" \/><\/center><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.confianzit.com\/cit-blog\/7-tips-for-optimizing-performance-in-reactjs\/#7_Tips_for_Increasing_Reacts_Performance\" title=\"7 Tips for Increasing React\u2019s Performance\">7 Tips for Increasing React\u2019s Performance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.confianzit.com\/cit-blog\/7-tips-for-optimizing-performance-in-reactjs\/#1_Use_Lazy_Loading_for_images\" title=\"1. Use Lazy Loading for images\">1. Use Lazy Loading for images<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.confianzit.com\/cit-blog\/7-tips-for-optimizing-performance-in-reactjs\/#2_Use_Memoization_React_Memo\" title=\"2. Use Memoization\u00a0 [React Memo]\">2. Use Memoization\u00a0 [React Memo]<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.confianzit.com\/cit-blog\/7-tips-for-optimizing-performance-in-reactjs\/#3_Or_use_shouldCompontentUpdate\" title=\"3. Or use shouldCompontentUpdate\">3. Or use shouldCompontentUpdate<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.confianzit.com\/cit-blog\/7-tips-for-optimizing-performance-in-reactjs\/#4_Throttle_and_Debounce\" title=\"4. Throttle and Debounce\">4. Throttle and Debounce<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.confianzit.com\/cit-blog\/7-tips-for-optimizing-performance-in-reactjs\/#5_Deal_with_your_lists\" title=\"5. Deal with your lists\">5. Deal with your lists<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.confianzit.com\/cit-blog\/7-tips-for-optimizing-performance-in-reactjs\/#6_Test_with_the_production_build\" title=\"6. Test with the production build\">6. Test with the production build<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.confianzit.com\/cit-blog\/7-tips-for-optimizing-performance-in-reactjs\/#7_Find_your_performance_hogs\" title=\"7. Find your performance hogs\">7. Find your performance hogs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.confianzit.com\/cit-blog\/7-tips-for-optimizing-performance-in-reactjs\/#Speed_Up_Your_Reaction_Time\" title=\"Speed Up Your Reaction Time\">Speed Up Your Reaction Time<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.confianzit.com\/cit-blog\/7-tips-for-optimizing-performance-in-reactjs\/#Talk_to_our_experts_now\" title=\"    Talk to our experts now  \">    Talk to our experts now  <\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.confianzit.com\/cit-blog\/7-tips-for-optimizing-performance-in-reactjs\/#Talk_To_Our_Experts_Now\" title=\"Talk To Our Experts Now\n\t\">Talk To Our Experts Now\n\t<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"7_Tips_for_Increasing_Reacts_Performance\"><\/span><span style=\"font-weight: 400;\">7 Tips for Increasing React\u2019s Performance<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">React is a relatively new library, so people are still working on ways to optimize its performance.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">These are compilations of both large and small tweaks you can make that can increase the speed of your application. <\/span><a href=\"https:\/\/www.confianzit.com\/cit-blog\/best-practices-for-developing-with-reactjs\/\"><span style=\"font-weight: 400;\">React<\/span><\/a><span style=\"font-weight: 400;\"> struggles specifically with rendering a lot of components quickly, so a lot of the tips center around figuring out how to make modifications to get around these limitations.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"1_Use_Lazy_Loading_for_images\"><\/span><span style=\"font-weight: 400;\">1. Use Lazy Loading for images<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">React struggles with rendering things quickly, and that can really affect performance and your page load time. And that becomes ten times worse when you have an image-heavy page.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Lazy Loading (AKA code splitting or data fetching) takes some of the load off by letting you prioritize what&#8217;s rendered first. That means that the header can show up first and that interactive picture that the user can click on, while the images near the bottom have more time to load.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This React Lazy Load Image Component is a great option.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Beyond using Lazy Loading, also make sure you\u2019ve optimized the images themselves by compressing, resizing, or converting them to something like webp.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Use_Memoization_React_Memo\"><\/span><span style=\"font-weight: 400;\">2. Use Memoization\u00a0 [React Memo]<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">One of the best ways to speed up React is by reducing the number of unnecessary renders. React re-renders components when either prop or state values change, including a child&#8217;s components when a parent&#8217;s components change.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">React.memo (often confused with <\/span><b>useMemo<\/b><span style=\"font-weight: 400;\">) is a higher-order component that optimizes the rendering process by keeping React from wasting time and bandwidth on child components. It memoizes child components and only re-renders them when their props change.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Or_use_shouldCompontentUpdate\"><\/span><span style=\"font-weight: 400;\">3. Or use shouldCompontentUpdate<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Another way to keep things from re-rendering unnecessarily is by using <\/span><b>shouldCompontentUpdate<\/b><span style=\"font-weight: 400;\">. React calls this when there are new props or states before rendering. If it returns false, then React knows that it can skip re-rendering.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This optimizes class components in a similar way to how React.memo optimizes function components. Using the two together can give you a good performance boost.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_Throttle_and_Debounce\"><\/span><span style=\"font-weight: 400;\">4. Throttle and Debounce<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">When you put the power in the user&#8217;s hand, there is always some potential for the unexpected. User input can really tank performance by calling functions more than they should.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">That&#8217;s when using throttling and debouncing comes in. Debouncing ensures that a function is only executed once after some time elapses without further user input. Throttling limits the number of times something can be executed per period of time. Both of them reduce the load on the server and keep your application reactive.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">You can implement debouncing with the <\/span><b>setTimeout()<\/b><span style=\"font-weight: 400;\"> and <\/span><b>clearTimeout()<\/b><span style=\"font-weight: 400;\"> functions. Throttling works with the <\/span><b>setTimeout()<\/b><span style=\"font-weight: 400;\"> function with a flag variable.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_Deal_with_your_lists\"><\/span><span style=\"font-weight: 400;\">5. Deal with your lists<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Depending on how long they are, lists can absolutely cripple your performance. However, there are a couple of ways to optimize them.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">First, you can virtualize long lists by rendering only the visible part of a list. This is similar to Lazy Loading, but it pushes it further by rendering as the user scrolls, boosting performance. This is the best choice for long lists of static items.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The other technique is using key coordinates. This is best for dynamic lists since it limits re-rendering. Key coordination is when you assign each item on a list a unique key. Make sure to assign keys within the code itself and don\u2019t have them generated on the fly.\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_Test_with_the_production_build\"><\/span><span style=\"font-weight: 400;\">6. Test with the production build<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">When developing with <\/span><a href=\"https:\/\/www.confianzit.com\/cit-blog\/best-practices-for-developing-with-reactjs\/\"><span style=\"font-weight: 400;\">React<\/span><\/a><span style=\"font-weight: 400;\">, there are a lot of warnings included to help you catch mistakes. However, these can artificially slow down your website, making it seem like things are taking longer than they actually are. So if you&#8217;re not actually sure how quickly your site is rendering, make sure you&#8217;re visiting your site in production mode.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Depending on your build, there are a couple of ways to build a production app, so make sure you\u2019re using the correct one.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_Find_your_performance_hogs\"><\/span><span style=\"font-weight: 400;\">7. Find your performance hogs<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you&#8217;ve done everything you can and still can&#8217;t identify what&#8217;s slowing your system down, it&#8217;s time to call in React\u2019s Developer Tools. These tools inspect React components and can identify performance problems. You can download these tools as extensions for most major browsers, but you can also install the <\/span><b>react-dev tools<\/b><span style=\"font-weight: 400;\"> npm package.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Using the developer tools to visit a website, you can visit your website to gather performance information when the application renders. It will highlight what is rendering as well as give an explanation as to why it\u2019s rendering.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The other good option is React\u2019s <\/span><b>&lt;Profiler&gt; <\/b><span style=\"font-weight: 400;\">tool. If you wrap a component tree in a <\/span><b>&lt;Profiler&gt;<\/b><span style=\"font-weight: 400;\">, you can measure its rendering permanence. It measures how often an app renders and what the cost of it is. It\u2019s a great first step before memoization.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">React&#8217;s tools are a great last line of defense when cutting or optimizing elements to speed up the overall program.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Speed_Up_Your_Reaction_Time\"><\/span><span style=\"font-weight: 400;\">Speed Up Your Reaction Time<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><a href=\"https:\/\/www.confianzit.com\/cit-blog\/best-practices-for-developing-with-reactjs\/\"><span style=\"font-weight: 400;\">React<\/span><\/a><span style=\"font-weight: 400;\"> is a great library, but that&#8217;s not especially helpful if your user is constantly frustrated by its poor speed and interactivity. So while you can get away with not optimizing for smaller projects, these are still some good things to remember for that extra performance boost.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you\u2019re making an app, <\/span><a href=\"https:\/\/www.confianzit.com\/\"><span style=\"font-weight: 400;\">Confianz<\/span><\/a><span style=\"font-weight: 400;\"> can help. Our team works with you every step of the way to help make sure your app is a success.\u00a0<\/span><\/p>\n<p><a href=\"https:\/\/www.confianzit.com\/\"><span style=\"font-weight: 400;\">Confianz Global, Inc.<\/span><\/a><span style=\"font-weight: 400;\"> is one of the <\/span><a href=\"https:\/\/www.confianzit.com\/mobile-app-development\"><span style=\"font-weight: 400;\">US&#8217;s leading mobile app development agencies<\/span><\/a><span style=\"font-weight: 400;\">. Headquartered in Charlotte, NC, the company has been successfully assisting startups, small and medium-sized businesses, and large corporations for more than a decade. Their solutions cover multiple domains, <\/span><a href=\"https:\/\/www.confianzit.com\/odoo-customization\"><span style=\"font-weight: 400;\">Odoo ERP Customization<\/span><\/a><span style=\"font-weight: 400;\"> &amp; <\/span><a href=\"https:\/\/www.confianzit.com\/odoo-implementation\"><span style=\"font-weight: 400;\">Implementation<\/span><\/a><span style=\"font-weight: 400;\">, <\/span><a href=\"https:\/\/www.confianzit.com\/web-design-development-company\"><span style=\"font-weight: 400;\">custom web application development<\/span><\/a><span style=\"font-weight: 400;\">, and <\/span><a href=\"https:\/\/www.confianzit.com\/machine-learning-and-ai\"><span style=\"font-weight: 400;\">artificial intelligence<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So <\/span><a href=\"https:\/\/www.confianzit.com\/contact-us\"><span style=\"font-weight: 400;\">contact us<\/span><\/a><span style=\"font-weight: 400;\"> today to get started!<\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;2_5&#8243; 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It\u2019s now free and open-source as of 2013, and it\u2019s now on its 18th version.\u00a0 Because of its simplicity and ease of use, React is an extremely popular library and is one of the most used libraries today. However, it&#8217;s [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":28757,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"<p><a href=\"https:\/\/www.confianzit.com\/cit-blog\/best-practices-for-developing-with-reactjs\/\"><span style=\"font-weight: 400;\">ReactJS<\/span><\/a><span style=\"font-weight: 400;\"> (React or React.js) is a JavaScript library created by Meta (formerly Facebook) in 2011. It\u2019s now free and open-source as of 2013, and it\u2019s now on its 18th version.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Because of its simplicity and ease of use, React is an extremely popular library and is one of the most used libraries today. However, it's generally optimized for more straightforward projects and can suffer from slow performance and lag with more complicated programs.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">However, that doesn't mean you can't use it for your project; you'll just have to optimize your work along the way. So follow these seven tips to boost your application's performance while using ReactJS.<\/span><\/p><h2><span style=\"font-weight: 400;\">7 Tips for Increasing React\u2019s Performance<\/span><\/h2><p><span style=\"font-weight: 400;\">React is a relatively new library, so people are still working on ways to optimize its performance.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">These are compilations of both large and small tweaks you can make that can increase the speed of your application. <\/span><a href=\"https:\/\/www.confianzit.com\/cit-blog\/best-practices-for-developing-with-reactjs\/\"><span style=\"font-weight: 400;\">React<\/span><\/a><span style=\"font-weight: 400;\"> struggles specifically with rendering a lot of components quickly, so a lot of the tips center around figuring out how to make modifications to get around these limitations.<\/span><\/p><h3><span style=\"font-weight: 400;\">1. Use Lazy Loading for images<\/span><\/h3><p><span style=\"font-weight: 400;\">React struggles with rendering things quickly, and that can really affect performance and your page load time. And that becomes ten times worse when you have an image-heavy page.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Lazy Loading (AKA code splitting or data fetching) takes some of the load off by letting you prioritize what's rendered first. That means that the header can show up first and that interactive picture that the user can click on, while the images near the bottom have more time to load.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">This React Lazy Load Image Component is a great option.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Beyond using Lazy Loading, also make sure you\u2019ve optimized the images themselves by compressing, resizing, or converting them to something like webp.<\/span><\/p><h3><span style=\"font-weight: 400;\">2. Use Memoization\u00a0 [React Memo]<\/span><\/h3><p><span style=\"font-weight: 400;\">One of the best ways to speed up React is by reducing the number of unnecessary renders. React re-renders components when either prop or state values change, including a child's components when a parent's components change.<\/span><\/p><p><span style=\"font-weight: 400;\">React.memo (often confused with <\/span><b>useMemo<\/b><span style=\"font-weight: 400;\">) is a higher-order component that optimizes the rendering process by keeping React from wasting time and bandwidth on child components. It memoizes child components and only re-renders them when their props change.<\/span><\/p><h3><span style=\"font-weight: 400;\">3. Or use shouldCompontentUpdate<\/span><\/h3><p><span style=\"font-weight: 400;\">Another way to keep things from re-rendering unnecessarily is by using <\/span><b>shouldCompontentUpdate<\/b><span style=\"font-weight: 400;\">. React calls this when there are new props or states before rendering. If it returns false, then React knows that it can skip re-rendering.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">This optimizes class components in a similar way to how React.memo optimizes function components. Using the two together can give you a good performance boost.<\/span><\/p><h3><span style=\"font-weight: 400;\">4. Throttle and Debounce<\/span><\/h3><p><span style=\"font-weight: 400;\">When you put the power in the user's hand, there is always some potential for the unexpected. User input can really tank performance by calling functions more than they should.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">That's when using throttling and debouncing comes in. Debouncing ensures that a function is only executed once after some time elapses without further user input. Throttling limits the number of times something can be executed per period of time. Both of them reduce the load on the server and keep your application reactive.<\/span><\/p><p><span style=\"font-weight: 400;\">You can implement debouncing with the <\/span><b>setTimeout()<\/b><span style=\"font-weight: 400;\"> and <\/span><b>clearTimeout()<\/b><span style=\"font-weight: 400;\"> functions. Throttling works with the <\/span><b>setTimeout()<\/b><span style=\"font-weight: 400;\"> function with a flag variable.<\/span><\/p><h3><span style=\"font-weight: 400;\">5. Deal with your lists<\/span><\/h3><p><span style=\"font-weight: 400;\">Depending on how long they are, lists can absolutely cripple your performance. However, there are a couple of ways to optimize them.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">First, you can virtualize long lists by rendering only the visible part of a list. This is similar to Lazy Loading, but it pushes it further by rendering as the user scrolls, boosting performance. This is the best choice for long lists of static items.<\/span><\/p><p><span style=\"font-weight: 400;\">The other technique is using key coordinates. This is best for dynamic lists since it limits re-rendering. Key coordination is when you assign each item on a list a unique key. Make sure to assign keys within the code itself and don\u2019t have them generated on the fly.\u00a0<\/span><\/p><h3><span style=\"font-weight: 400;\">6. Test with the production build<\/span><\/h3><p><span style=\"font-weight: 400;\">When developing with <\/span><a href=\"https:\/\/www.confianzit.com\/cit-blog\/best-practices-for-developing-with-reactjs\/\"><span style=\"font-weight: 400;\">React<\/span><\/a><span style=\"font-weight: 400;\">, there are a lot of warnings included to help you catch mistakes. However, these can artificially slow down your website, making it seem like things are taking longer than they actually are. So if you're not actually sure how quickly your site is rendering, make sure you're visiting your site in production mode.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Depending on your build, there are a couple of ways to build a production app, so make sure you\u2019re using the correct one.<\/span><\/p><h3><span style=\"font-weight: 400;\">7. Find your performance hogs<\/span><\/h3><p><span style=\"font-weight: 400;\">If you've done everything you can and still can't identify what's slowing your system down, it's time to call in React\u2019s Developer Tools. These tools inspect React components and can identify performance problems. You can download these tools as extensions for most major browsers, but you can also install the <\/span><b>react-dev tools<\/b><span style=\"font-weight: 400;\"> npm package.<\/span><\/p><p><span style=\"font-weight: 400;\">Using the developer tools to visit a website, you can visit your website to gather performance information when the application renders. It will highlight what is rendering as well as give an explanation as to why it\u2019s rendering.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">The other good option is React\u2019s <\/span><b><Profiler> <\/b><span style=\"font-weight: 400;\">tool. If you wrap a component tree in a <\/span><b><Profiler><\/b><span style=\"font-weight: 400;\">, you can measure its rendering permanence. It measures how often an app renders and what the cost of it is. It\u2019s a great first step before memoization.<\/span><\/p><p><span style=\"font-weight: 400;\">React's tools are a great last line of defense when cutting or optimizing elements to speed up the overall program.<\/span><\/p><h2><span style=\"font-weight: 400;\">Speed Up Your Reaction Time<\/span><\/h2><p><a href=\"https:\/\/www.confianzit.com\/cit-blog\/best-practices-for-developing-with-reactjs\/\"><span style=\"font-weight: 400;\">React<\/span><\/a><span style=\"font-weight: 400;\"> is a great library, but that's not especially helpful if your user is constantly frustrated by its poor speed and interactivity. So while you can get away with not optimizing for smaller projects, these are still some good things to remember for that extra performance boost.<\/span><\/p><p><span style=\"font-weight: 400;\">If you\u2019re making an app, <\/span><a href=\"https:\/\/www.confianzit.com\/\"><span style=\"font-weight: 400;\">Confianz<\/span><\/a><span style=\"font-weight: 400;\"> can help. Our team works with you every step of the way to help make sure your app is a success.\u00a0<\/span><\/p><p><a href=\"https:\/\/www.confianzit.com\/\"><span style=\"font-weight: 400;\">Confianz Global, Inc.<\/span><\/a><span style=\"font-weight: 400;\"> is one of the <\/span><a href=\"https:\/\/www.confianzit.com\/mobile-app-development\"><span style=\"font-weight: 400;\">US's leading mobile app development agencies<\/span><\/a><span style=\"font-weight: 400;\">. Headquartered in Charlotte, NC, the company has been successfully assisting startups, small and medium-sized businesses, and large corporations for more than a decade. Their solutions cover multiple domains, <\/span><a href=\"https:\/\/www.confianzit.com\/odoo-customization\"><span style=\"font-weight: 400;\">Odoo ERP Customization<\/span><\/a><span style=\"font-weight: 400;\"> & <\/span><a href=\"https:\/\/www.confianzit.com\/odoo-implementation\"><span style=\"font-weight: 400;\">Implementation<\/span><\/a><span style=\"font-weight: 400;\">, <\/span><a href=\"https:\/\/www.confianzit.com\/web-design-development-company\"><span style=\"font-weight: 400;\">custom web application development<\/span><\/a><span style=\"font-weight: 400;\">, and <\/span><a href=\"https:\/\/www.confianzit.com\/machine-learning-and-ai\"><span style=\"font-weight: 400;\">artificial intelligence<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p><p><span style=\"font-weight: 400;\">So <\/span><a href=\"https:\/\/www.confianzit.com\/contact-us\"><span style=\"font-weight: 400;\">contact us<\/span><\/a><span style=\"font-weight: 400;\"> today to get started!<\/span><\/p>","_et_gb_content_width":"","footnotes":""},"categories":[96,427],"tags":[150,152,396,149,429],"_links":{"self":[{"href":"https:\/\/www.confianzit.com\/cit-blog\/wp-json\/wp\/v2\/posts\/28740"}],"collection":[{"href":"https:\/\/www.confianzit.com\/cit-blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.confianzit.com\/cit-blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.confianzit.com\/cit-blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/www.confianzit.com\/cit-blog\/wp-json\/wp\/v2\/comments?post=28740"}],"version-history":[{"count":14,"href":"https:\/\/www.confianzit.com\/cit-blog\/wp-json\/wp\/v2\/posts\/28740\/revisions"}],"predecessor-version":[{"id":28759,"href":"https:\/\/www.confianzit.com\/cit-blog\/wp-json\/wp\/v2\/posts\/28740\/revisions\/28759"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.confianzit.com\/cit-blog\/wp-json\/wp\/v2\/media\/28757"}],"wp:attachment":[{"href":"https:\/\/www.confianzit.com\/cit-blog\/wp-json\/wp\/v2\/media?parent=28740"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.confianzit.com\/cit-blog\/wp-json\/wp\/v2\/categories?post=28740"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.confianzit.com\/cit-blog\/wp-json\/wp\/v2\/tags?post=28740"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}