Delay loading non-essential JavaScript code

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Removing unused CSS in WP Rocket
Additionally, there is a feature called “Delayed JavaScript Loading”. This feature tells the browser to wait to load some JavaScript files until the main content of the website (the HTML) is displayed.

This way, users see the website content faster, even if all the background features have not yet loaded.

To learn more about how to enable these features, see our article on how to reduce render-blocking CSS and JavaScript in WordPress .

9. Enable WordPress Caching
Caching does not directly reduce the size of the DOM, but it significantly improves the perceived performance of the website.

Here's what happens when caching is enabled: when a user visits your website, their browser can check the cache first. If the files are already stored locally, they can load much faster, significantly reducing page load times.

This way the DOM loads and displays faster, making the visitor experience smoother.

Caching also helps the server run more efficiently by lightening its workload. This frees it up to focus on important tasks like DOM processing, thus speeding up load times.

Fortunately, setting up browser caching is easy with a plugin like WP Rocket . The plugin automatically peru telemarketing data enables caching with the optimal settings for your website.

How to set up the WP Rocket caching plugin
Even better, WP Rocket continuously caches your website at all times. Whenever the cache is cleared (manually or automatically), WP Rocket automatically generates new cache files.

WP Rocket also gives you the ability to clear your WordPress cache at any time. This can be useful if you make significant changes to your website and want to make sure your users are seeing the latest version.

How to clear the WP Rocket cache manually
For more details on WP Rocket’s caching features, you can refer to the Setting Caching Options section of our WP Rocket installation guide.

10. Use a WordPress CDN
A CDN (Content Delivery Network) is a network of servers spread across the world. Although a CDN does not directly change the size of your website's code, it does give the impression that your website loads faster.