Optimize CLS in WordPress
Sena Yaptangco

By: Sena Yaptangco

Published On: April 15, 2024
3.6 min read

Optimize CLS: Step-by-Step Guide to Diagnose and Fix Cumulative Layout Shift Issues in WordPress

Are you looking to enhance the performance of your WordPress website, improve page loading speed, and provide a seamless user experience? Cumulative Layout Shift (CLS) can be a significant factor affecting these aspects. In this comprehensive guide, we will walk you through step-by-step instructions to diagnose and fix CLS issues in WordPress, ensuring optimal website performance and user satisfaction.

Understanding the Importance of CLS

Cumulative Layout Shift (CLS) refers to the unexpected shifting of page elements as a user interacts with a website. This can result in frustrating experiences, especially when buttons, images, or other interactive elements move unexpectedly. CLS plays a crucial role in determining the overall layout stability and user experience.

By optimizing CLS, you can minimize layout shifts and provide a smoother browsing experience. Additionally, Google considers CLS as one of the key factors in its Core Web Vitals, impacting search engine rankings. Therefore, optimizing CLS is essential for both user satisfaction and SEO performance.

Diagnosing CLS Issues in WordPress

To diagnose CLS issues in your WordPress website, follow these steps:

  1. Use Web Vitals Tools: Start by utilizing Google’s Web Vitals tools, such as the Cumulative Layout Shift (CLS) Debugger, which helps identify layout shift scores and affected elements.
  2. Analyze Key Metrics: Review the CLS score, impacted elements, and related metrics provided by the Web Vitals tools. Identify patterns or recurring issues that cause layout shifts.
  3. Inspect Code and Elements: Use browser developer tools to inspect the affected elements and their CSS properties. Look for elements with dynamic dimensions or missing width and height attributes, as these are common causes of CLS.

By following these steps, you will gain a deeper understanding of the CLS issues present on your WordPress website.

Resolving CLS Issues in WordPress

Once you have diagnosed the CLS issues, it’s time to take action. Here are effective methods to resolve CLS problems in WordPress:

  1. Specify Image Dimensions: Ensure that images have explicit width and height attributes in the HTML markup. This helps the browser reserve the necessary space, preventing unexpected layout shifts.
  2. Lazy Load Images: Implement lazy loading techniques to delay the loading of images until they come into the viewport. This prevents sudden content jumps caused by images loading dynamically.
  3. Minimize DOM Manipulations: Reduce unnecessary DOM manipulations and ensure that dynamic content additions do not affect the layout. This can be achieved by optimizing JavaScript and CSS code.

By implementing these strategies, you can effectively mitigate CLS issues and optimize the performance of your WordPress website.

Additional Best Practices for CLS Optimization

Here are some additional best practices to optimize CLS in WordPress:

      • Optimize Third-Party Scripts: Evaluate and optimize third-party scripts to minimize their impact on CLS. Load scripts asynchronously or defer their execution to prevent delays in rendering and layout shifts.
      • Avoid Invasive Interstitials: Interstitials or pop-ups that disrupt the user’s browsing experience can lead to significant CLS. Use non-intrusive alternatives, such as banners or slide-ins, to maintain layout stability.
      • Test Responsiveness: Ensure your website is responsive across different devices and screen sizes. Test and optimize the layout for mobile devices to prevent CLS issues that may arise due to content reflow.

By following these additional best practices, you can further optimize CLS and create a seamless user experience.


For more detailed information on diagnosing and fixing CLS issues, you may find the following sources helpful:

By following this step-by-step guide, implementing the suggested techniques, and referring to the provided sources, you can effectively optimize CLS in your WordPress website. Improve your website’s performance, enhance user experience, and elevate your SEO rankings.

Remember, optimizing CLS is an ongoing process. Regularly monitor your website’s performance, analyze metrics, and make necessary adjustments to ensure a stable and engaging browsing experience for your users.

Start optimizing CLS today and take your WordPress website to the next level!

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