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Fixing CLS Issue in WordPress

When it comes to managing your WordPress website, encountering a Cumulative Layout Shift (CLS) issue can be quite a headache. But don’t worry, we’re here to help you understand and resolve this problem effectively.

CLS is a vital aspect of the Core Web Vitals, which Google uses to evaluate user experience on your site. A high CLS score means your page layout shifts abruptly, causing a poor browsing experience. Let’s dive into how you can fix this issue and improve your website’s performance.

Understanding CLS and Its Importance

Before we delve into the solutions, it’s crucial to understand what CLS is and why it matters. CLS measures the sum total of all individual layout shift scores for every unexpected layout shift during the lifespan of a page. In simpler terms, it gauges how much your page layout jumps around while a user is interacting with it.

CLS is important because it directly impacts the user experience. A high CLS score can lead to user frustration as content moves unexpectedly, causing accidental clicks or difficulty reading. This can result in lower engagement, higher bounce rates, and ultimately, a drop in your search engine rankings.

Identifying the Causes of High CLS

Several factors can contribute to a high CLS score. Identifying these can help you pinpoint where to focus your efforts. Some common causes include:

  • Images without dimensions: If your images don’t have specified height and width, the browser won’t know how much space to allocate, causing layout shifts.
  • Ads, embeds, and iframes without dimensions: Similar to images, these elements can cause layout shifts if their dimensions aren’t specified.
  • Web Fonts causing FOIT/FOUT: Flash of Invisible Text (FOIT) or Flash of Unstyled Text (FOUT) can cause shifts when web fonts load.
  • Dynamically injected content: Content that loads dynamically, like a pop-up, can push existing content, causing a layout shift.

Now that we’ve identified potential causes, let’s move on to the solutions.

How to Fix CLS Issue in WordPress

Specify Dimensions for Images and Media

One of the easiest ways to reduce CLS is by specifying dimensions for all images, videos, and other media. This helps the browser allocate the correct space while the page loads, preventing any unexpected shifts.

You can manually add width and height attributes to your image tags, or use WordPress plugins like Smush or ShortPixel, which automatically add these attributes to your images.

Handle Ads and Pop-ups Carefully

Ads and pop-ups can significantly contribute to layout shifts if not handled correctly. Ensure that you reserve sufficient space for ads and avoid inserting them above existing content. For pop-ups, consider using user interaction to trigger them, rather than having them load automatically.

Several WordPress plugins can help manage ads and pop-ups effectively, reducing their impact on your CLS score.

Optimize Web Fonts

Web fonts can cause layout shifts when they load and replace fallback fonts. To prevent this, you can pre-load key web fonts, use font-display: optional, or host fonts locally. Each of these methods can help reduce FOIT/FOUT and improve your CLS score.

WordPress plugins like Autoptimize or WP Rocket can help optimize web fonts and reduce their impact on layout shifts.

Monitoring Your CLS Score

After implementing these fixes, it’s important to monitor your CLS score to ensure improvements. Tools like Google’s PageSpeed Insights, Search Console, and Lighthouse can provide detailed reports on your Core Web Vitals, including CLS.

Remember, improving your CLS score is an ongoing process. Regular monitoring and optimization can help maintain a low CLS score, providing a better user experience and potentially improving your search engine rankings.


Fixing the CLS issue in WordPress might seem daunting at first, but with a clear understanding of the problem and the right strategies, you can significantly improve your website’s performance. By specifying dimensions for images and media, handling ads and pop-ups carefully, and optimizing web fonts, you can reduce layout shifts and enhance your site’s user experience.

Remember, a better user experience translates to better engagement, lower bounce rates, and higher search engine rankings. So, take the time to fix the CLS issue on your WordPress site and reap the benefits of a well-optimized website.

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