How to Fix Oversized DOM in WordPress (11 Expert Tips)

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The “Avoid excessive DOM size” warning may appear in Google Lighthouse or other website speed tools. It basically means that your website has too many elements, which can slow down loading times and frustrate visitors.

Fortunately, there are a few things you can do to reduce the size of the DOM and improve WordPress performance.

At WPBeginner, we have not only optimized our own websites, but we have also helped countless users improve their site speed. With this experience, we have identified the most effective methods to reduce DOM size and increase WordPress performance.

In this article, we will show you our tried and tested methods to fix excessive DOM size in WordPress.

How to Fix Excessive DOM Size in WordPress
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What does the “Avoid excessive DOM size” caution mean?
Have you ever run a speed test on your WordPress website and come across a warning called “Avoid excessive DOM size”?

This warning appears in speed testing tools like Google Lighthouse, Google PageSpeed ​​Insights or GTMetrix. It indicates that your website has too many elements, which can slow down the loading speed.

Avoid an excessive DOM size warning in PageSpeed Insights
But what exactly is the DOM and why does its size matter? Let's dig deeper.