{"id":2971,"date":"2022-05-22T09:45:00","date_gmt":"2022-05-22T09:45:00","guid":{"rendered":"https:\/\/seopolarity.com\/blog\/?p=2971"},"modified":"2022-05-23T09:14:22","modified_gmt":"2022-05-23T09:14:22","slug":"googles-6-javascript-optimization-tips","status":"publish","type":"post","link":"https:\/\/seopolarity.com\/blog\/googles-6-javascript-optimization-tips\/2022\/","title":{"rendered":"Google&#8217;s 6 JavaScript Optimization Tips"},"content":{"rendered":"\n<p>Developer Advocate Alan Kent shares six ways to optimize <a href=\"https:\/\/seopolarity.com\/blog\/its-normal-for-cached-javascript-pages-to-appear-empty-according-to-google\/2022\/\">JavaScript<\/a> to <a href=\"https:\/\/seopolarity.com\/blog\/7-proven-ways-to-improve-the-performance-of-your-ppc-campaign\/2021\/\">improve the performance<\/a> of your website in a new video from Google.<\/p>\n\n\n\n<p>Kent discusses the most common performance issues caused by JavaScript and how to resolve them.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-1-prevent-the-spread-of-javascript-files\">1. Prevent the spread of JavaScript files<\/h2>\n\n\n\n<p>Keep the number of JavaScript files on your site to a minimum.<\/p>\n\n\n\n<p>If you&#8217;re not careful, the number of JavaScript files you have can quickly grow, especially if each UI component is in its file.<\/p>\n\n\n\n<p>It is possible to improve website performance by reducing the number of JavaScript files that a browser must download.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How to Recognize<\/h3>\n\n\n\n<p>The PageSpeed Insights report&#8217;s Opportunity section contains recommendations tailored to your site.<\/p>\n\n\n\n<p>Keep request counts low and transfer sizes small, according to the advice.<\/p>\n\n\n\n<p>For a summary of the number and sizes of resource types requested, including JavaScript files, click on the recommendation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How to Repair<\/h3>\n\n\n\n<p>This issue can be resolved in a variety of ways. Combining smaller files into a single, larger file to download is one option Google suggests.<\/p>\n\n\n\n<p>Another solution is to enable HTTP2, which can improve performance without the need to join files.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Limit the number of DNS lookups<\/h2>\n\n\n\n<p>Avoid making too many DNS lookups for the reference JavaScript files, as this will slow down a user&#8217;s first visit.<\/p>\n\n\n\n<p>In sections like reducing JavaScript execution time, How To Detect PageSpeed Insights can show you a list of domain names used in URLs.<\/p>\n\n\n\n<p>Another way to see all the domain names mentioned is to use the network tab in Chrome Developer Tools.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How to Repair<\/h3>\n\n\n\n<p>Google recommends hosting a copy of externally referenced JavaScript files on your site to reduce the number of DNS lookups.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. Remove inefficient JavaScript<\/h2>\n\n\n\n<p>Reduce or remove inefficient JavaScript, which can cause web pages to load slowly and provide poor user experiences.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How to Recognize<\/h3>\n\n\n\n<p>In Google&#8217;s PageSpeed Insights report, look for the following opportunities:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Reduce JavaScript execution time: T<\/strong>his displays scripts that spent a significant amount of CPU time parsing or executing JavaScript code.<\/li><li><strong>Remove render-blocking resources<\/strong>, such as JavaScript, which may be executed before the page can be rendered, causing the user to wait longer for any content.<\/li><li><strong>If used incorrectly<\/strong>, Document. write can cause significant performance issues on a page by blocking other operations.<\/li><li><strong>No passive listeners are used:<\/strong> A passive listener tells the browser that JavaScript code won&#8217;t call a function that prevents scrolling, allowing the browser to scroll the page while JavaScript is still running.<\/li><li><strong>Eliminating inefficient<\/strong> JavaScript is a larger topic that is outside the scope of Google&#8217;s video.<\/li><\/ul>\n\n\n\n<p>The solutions usually entail writing JavaScript code differently. Profiling existing code and writing your scaled-down versions of more powerful components are examples of techniques.<\/p>\n\n\n\n<p>Read <a href=\"https:\/\/fileproinfo.com\/blog\/top-7-programming-languages-for-test-automation-in-2022\/2022\/\" target=\"_blank\" rel=\"noreferrer noopener\">Top 7 Programming Languages For Test Automation In 2022<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. Remove any unused JavaScript code<\/h2>\n\n\n\n<p>Unused JavaScript is also inefficient, but Google claims that this issue is widespread enough to warrant its mention.<\/p>\n\n\n\n<p>When you reuse code across multiple sites, you risk including JavaScript that isn&#8217;t required.<\/p>\n\n\n\n<p>Even if JavaScript is never used, the web browser must still download and parse it, which is a waste of time and resources.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How to Recognize<\/h3>\n\n\n\n<p>In Google&#8217;s PageSpeed Insights report, look for the following opportunities:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Reduce unused JavaScript: <\/strong>This displays JavaScript that was not executed during page loading.<\/li><li><strong>Prevent massive network payloads:<\/strong> By highlighting large library downloads, identifies areas for improvement.<\/li><li><strong>Reduce main-thread activity:<\/strong> Time spent parsing, compiling, and executing JavaScript is included.<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">How to Repair<\/h3>\n\n\n\n<p>Google suggests using a technique called tree-shaking to identify JavaScript that is never used and can be safely deleted.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5. Make JavaScript Files Smaller<\/h2>\n\n\n\n<p>When downloading your JavaScript files, make sure they are compressed. While decompressing the file contents takes more CPU time, Google claims compression is a win in the long run.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How to Recognize<\/h3>\n\n\n\n<p>A section of the PageSpeed Insights report highlights JavaScript files that could benefit from compression.<\/p>\n\n\n\n<p>By selecting Enable text compression, you can see which files should be compressed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How to Repair<\/h3>\n\n\n\n<p>If properly configured, most web browsers or content management systems have built-in support for compressing downloads.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">6. Set Appropriate JavaScript Code Cache Durations<\/h2>\n\n\n\n<p>Check that the cache expiry time headers for your JavaScript files are correct.<\/p>\n\n\n\n<p>This saves browsers the time and effort of checking for out-of-date JavaScript files in their cache, which improves performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How to Recognize<\/h3>\n\n\n\n<p>The HTTP response headers for downloaded JavaScript files can be checked in the Networking tab of Chrome Developer Tools. Look for Cache-Control and similar headers.<\/p>\n\n\n\n<p>Look for the opportunity titled Serve static assets with an efficient cache policy in PageSpeed Insights. When you click it, a list of resources, including JavaScript files, that could benefit from properly set cache headers appears.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How to Repair<\/h3>\n\n\n\n<p>Reference files from a shared public location to improve the caching of commonly used JavaScript files.<\/p>\n\n\n\n<p>When a user visits a site that uses the same JavaScript file, the browser can use a previously downloaded copy of the file to improve performance.<\/p>\n\n\n\n<p>See Google&#8217;s full video below for more information on any of the above JavaScript optimization recommendations:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich is-provider-embed-handler wp-block-embed-embed-handler wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"6 Tips for optimizing your website with JavaScript\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/sq_-3WM4wZA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p>Learn more from <a href=\"https:\/\/seopolarity.com\/blog\/category\/seo\/\">SEO<\/a> and read <a href=\"https:\/\/seopolarity.com\/blog\/site-dependence-on-javascript-a-problem-for-googlebot\/2022\/\">Site Dependence On JavaScript A Problem For Googlebot?<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>By optimising JavaScript, Google shares six ways to make your website faster and more efficient.<\/p>\n","protected":false},"author":1,"featured_media":2973,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[24],"tags":[],"class_list":["post-2971","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo"],"jetpack_publicize_connections":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Google&#039;s 6 JavaScript Optimization Tips | SEOPolarity<\/title>\n<meta name=\"description\" content=\"By optimising JavaScript, Google shares six ways to make your website faster and more efficient.\" \/>\n<meta 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