When a browser opens a website, it loads the entire HTML from top to bottom. Why Should You Remove Unused JavaScript from Your Website? Unused JavaScript Slows Down Your Page Load Time You just need to ensure there's no useless JavaScript clogging their code. Of course, there's no need to remove those elements from your website. Contact forms and social media sharing buttons (especially if they're attached to multiple pages on your site).Third-party tracking code (like Google Analytics and Facebook Pixel).The culprits of slow JavaScript execution time often include: While that code isn't essential for user experience, the browser still prioritizes it when processing the page.Īs a result, the essential elements of a website (think: above-the-fold content) are on standby until the render-blocking JavaScript takes its sweet time. Unused JavaScript refers to irrelevant or deferrable JS code on your website. Let's take a look! What Is Unused JavaScript? So, how can you ensure the JavaScript on your site executes as fast as possible? And why should you care? It's no wonder that reducing JavaScript execution time is crucial for improving your website’s Core Web Vitals.īy reducing or completely removing unused JavaScript, you can lower the execution time of the JavaScript files you actually need on your page.
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