Parsing = the process of “reading” and “understanding” the code by the browser □ To keep in mind:ĭefer = to load at a later time or postpone a part of the code Instead, the actual page content will get the loading priority over the JS code that must be executed immediately. You tell the browser not to process (parse) a part of the Javascript just yet. When you defer Javascript, here’s what happens: you postpone or delay the loading of Javascript to load the most important content first. What Do Defer and Parsing Mean in Javascript Deferring Javascript is a key optimization technique to minimize your main thread work and remove useless weight during the page load. What Does Defer Parsing of JavaScript Mean?ĭefer Parsing of Javascript means to delay the JS processing that is not needed immediately on the visitor’s screen. Because deferring JavaScript can be daunting at first, we’ll share some easy optimization techniques you can implement for your site. In this tutorial, you’ll learn everything you need to know about deferring Javascript and why it’s crucial for the performance of your WordPress site. In plain English, it means that some Javascript is affecting your site loading time - and that you should do something to improve speed. If you’ve ever audited your WordPress site through GTmetrix or PageSpeed Insights, you’ve probably come across the suggestion to “defer parsing of Javascript”: Eliminate render-blocking resources by deferring non-critical JS – Source: GTmetrix JavaScript is difficult to learn because it is powerful: it adds dynamic and interactive elements to the web page to engage with the user. Do you think dealing with JavaScript is challenging? You’re not alone.
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