The more scripts you have to process, the more page loading will increase.Ĭonsequently, if you delay some of the Javascripts, your browser will be able to focus on the most important: render the content being viewed by the visitor as fast as possible. Remember that the browser must go through the contents of all tags to load a page. Why Defer Loading of Javascript is Important for Performanceĭeferring loading of Javascript will significantly reduce the render time of your page and improve your performance. The DOM – or the critical content – will be shown to the visitors immediately instead of being blocked, like in our above example. When you defer parsing of JavaScript, you tell the browser to load and parse the JavaScript file separately. ⌛ What changes if you defer parsing of JS? Consequently, rendering the page content to the visitor takes more time.
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