Fix Cls Issue WordPress

Sep 6, 2023 | Web Development

Are you encountering the frustrating “Cls Issue” problem on your WordPress website? If so, fret not! This article will provide you with effective solutions to fix this issue seamlessly. Whether you are a novice or an experienced WordPress user, you’ll find these tips and tricks easy to implement, ensuring that your website’s Core Web Vitals remain intact and your users have the best possible experience. So, let’s dive into the details and get your Cls issue fixed in no time!

Fix Cls Issue WordPress

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Understanding CLS Issue

Definition of CLS

Cumulative Layout Shift (CLS) is a metric that measures the visual stability of a webpage. It quantifies how much the page layout changes during the loading process. CLS is calculated by multiplying the impact fraction by the distance fraction, where the impact fraction refers to the proportion of the viewport that is affected by layout shifts, and the distance fraction represents the distance that elements shift relative to the viewport.

Importance of CLS

Having a low CLS score is crucial for providing a positive user experience. When CLS is high, it can lead to frustrating and disruptive shifts in content, making it difficult for users to interact with the page. This can result in accidental clicks on undesired elements, such as ads or buttons, and overall diminish the trust and satisfaction that users have with a website.

How it impacts the website

A high CLS score can have several negative consequences for a website. Firstly, it can negatively impact user engagement and increase bounce rates. When users encounter unexpected layout shifts, they may become frustrated and leave the website before completing their intended actions. This can lead to a decrease in conversions and revenue for businesses.

Additionally, search engines like Google take CLS into account when ranking websites. Websites with a low CLS score are more likely to rank higher in search results, as they are considered to provide a better user experience. On the other hand, websites with a high CLS score may be penalized by search engines, resulting in lower visibility and organic traffic.

Factors Contributing to CLS Issue in WordPress

Themes and plugins

One of the main culprits behind CLS issues in WordPress is the use of poorly optimized themes and plugins. When themes and plugins are not developed with CLS in mind, they can introduce layout shifts during the loading process. This can be caused by elements being loaded after the initial render, causing content to shift unexpectedly.

To address this issue, it is important to choose themes and plugins that are known for their optimization and compatibility with CLS metrics. Regularly updating themes and plugins can also help to minimize CLS issues, as developers often release updates to improve performance and stability.

Inefficient CSS styles

CSS styles are an essential part of web design, but they can also contribute to CLS issues if not implemented properly. Loading large or inefficient CSS stylesheets can slow down the rendering process, resulting in layout shifts. Additionally, CSS styles that aren’t responsive and adapt to different screen sizes can cause elements to shift when viewed on different devices.

To prevent these issues, it is recommended to optimize CSS stylesheets by minifying and compressing them. This can reduce the file size and improve loading times. Adopting responsive design principles and using media queries to adjust styles based on screen size can also help to mitigate CLS problems.

Slow server response times

The speed at which a server responds to requests can impact CLS. If the server takes too long to respond, it can cause delays in loading resources, leading to unexpected shifts in the layout. This is particularly problematic when it comes to loading images, videos, and dynamic content.

To address this issue, optimizing server response times is essential. This can be achieved through various methods such as using a content delivery network (CDN) to cache static resources, optimizing database queries, enabling caching mechanisms, and ensuring efficient hosting infrastructure.

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Identifying the CLS Issues on your WordPress Site

Using Google’s PageSpeed Insights tool

Google’s PageSpeed Insights tool is a valuable resource for identifying CLS issues on your WordPress site. Simply enter the URL of your website and let the tool analyze its performance. The tool will provide a CLS score along with specific suggestions to improve it.

Web Vitals report in Google Search Console

Google Search Console also provides a Web Vitals report that includes CLS data for your website. This report gives you an overview of the CLS performance and any issues that need to be addressed. Regularly checking this report can help you stay on top of CLS issues and take appropriate actions to fix them.

Using Chrome’s DevTools

Another way to identify CLS issues on your WordPress site is by using Chrome’s DevTools. By inspecting the page elements and monitoring the layout changes during the loading process, you can identify which elements are causing unexpected shifts. This can help you pinpoint the specific areas that need to be addressed to improve CLS.

Resolving the CLS issues

Updating and optimizing WordPress themes

Keeping your WordPress themes up to date is crucial for minimizing CLS issues. Developers often release updates to address performance and stability issues, including CLS-related problems. By regularly updating your themes, you can benefit from these improvements and ensure a smoother user experience.

In addition to updates, optimizing your WordPress themes is also essential. This can involve various steps such as optimizing image sizes and formats, reducing unnecessary plugin dependencies, and using responsive design principles. By streamlining your themes, you can reduce the chances of layout shifts and improve CLS.

Optimizing the server response time

Slow server response times can greatly contribute to CLS issues. To optimize the server response time, start by choosing a reliable hosting provider that offers fast and stable servers. Additionally, consider implementing caching mechanisms, compressing resources, and optimizing database queries. These measures can significantly improve the loading speed and reduce layout shifts.

Cleaning up CSS and Javascript codes

Inefficient CSS and JavaScript codes can hamper the loading speed and contribute to CLS issues. By cleaning up and optimizing these codes, you can eliminate unnecessary bloat and reduce the chance of unexpected layout shifts. Minifying CSS and JavaScript files, removing unused styles and scripts, and deferring non-critical scripts can all help to improve CLS.

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Additional Tips to Improve CLS

Applying lazy loading for images and videos

Lazy loading is a technique that delays the loading of images and videos until they are actually needed. By implementing lazy loading, you can prevent large media files from causing layout shifts. This technique ensures that only the content visible within the viewport is loaded initially, improving the CLS score.

Setting dimensions for images

A common cause of CLS issues is images that are loaded without specified dimensions. When images are loaded without dimensions, the browser doesn’t know the exact space the image will occupy, leading to unexpected shifts. By setting explicit dimensions for images, you can reserve the required space in advance, reducing layout shifts.

Minimizing heavy content above the fold

Content that appears above the fold (initially visible portion of the webpage) should be lightweight and load quickly to minimize CLS. Avoid including heavy elements such as large images, videos, or complex animations at the top of your website. By keeping the above-the-fold content light, you can provide a faster and more stable user experience.

Preloading Key Assets to Improve CLS

Preloading fonts and stylesheets

To improve CLS, you can utilize the preloading technique for key assets such as fonts and stylesheets. Preloading ensures that these resources are fetched early in the loading process, reducing the likelihood of layout shifts caused by delayed loading. By specifying these critical assets for preloading, you can create a more stable layout for your WordPress site.

Limiting the number of preloaded content

While preloading can positively impact CLS, it’s important to strike a balance and avoid overloading the page with preloaded content. Preloading too many resources can lead to increased server requests and slow down the loading process, potentially causing layout shifts. It is advisable to prioritize and preload only the essential assets to maintain optimal performance.

Fix Cls Issue WordPress

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Plugins to Fix CLS issue in WordPress

Autoptimize, WP Rocket

Autoptimize and WP Rocket are popular WordPress plugins that can help optimize your website and fix CLS issues. These plugins offer features such as minification, caching, and lazy loading, which can greatly improve performance and reduce layout shifts. By utilizing these plugins and their configuration options, you can effectively address CLS problems.

LiteSpeed Cache

LiteSpeed Cache is another powerful caching plugin that can improve CLS by optimizing server response times. This plugin offers advanced caching techniques, including browser caching, database optimization, and image optimization. By leveraging the features of LiteSpeed Cache, you can enhance the loading speed of your WordPress site and reduce layout shifts.


Smush is a popular image optimization plugin for WordPress that can significantly impact CLS. By automatically compressing and resizing images, Smush reduces the file size without compromising image quality. This reduces the time it takes to load images, minimizing the chances of layout shifts caused by images loading too slowly.

Optimizing Ads to Fix CLS Issue

Using static size ad units

Dynamic or improperly sized ad units can contribute to CLS issues by causing layout shifts. To avoid this, it is recommended to use static size ad units that have fixed dimensions. This ensures that the space for the ad is reserved and prevents unexpected shifts when the ad loads.

Eliminating pop-up ads

Pop-up ads are notorious for causing sudden and disruptive layout shifts. Eliminating pop-up ads or replacing them with less intrusive ad formats can greatly improve CLS. Instead of relying on pop-ups, consider using banner ads or native ad formats that blend seamlessly with the content and minimize layout shifts.

Reserving space for ad slots

If you have multiple ad slots on your WordPress site, it is important to reserve the necessary space for each ad in advance. By allocating fixed dimensions for each ad slot, you can prevent layout shifts caused by ads loading at different times. This ensures that the content remains stable and improves the overall CLS.

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Optimizing Web Fonts to Enhance CLS

Using system fonts

One effective way to enhance CLS is by utilizing system fonts. System fonts are pre-installed on users’ devices, which means they don’t need to be downloaded, reducing the chance of layout shifts during font loading. By specifying system fonts as fallback options, you can provide a consistent user experience even before custom fonts are fully loaded.

Optimizing font loading

Optimizing font loading is crucial for minimizing layout shifts caused by fonts. By implementing techniques such as font preloading, asynchronous loading, and font display strategies, you can ensure that fonts are loaded efficiently and without disruptive shifts. These techniques prioritize providing a stable layout and improving CLS scores.

Hosting your own fonts

If you use custom fonts on your WordPress site, consider hosting them locally rather than relying on external font services. By hosting fonts locally, you can have more control over their loading and reduce the chances of layout shifts caused by delayed font loading. This can significantly improve the stability and CLS of your website.

Verifying the CLS Fix

Re-analyzing the site with PageSpeed Insights

After implementing the necessary changes to address CLS issues on your WordPress site, it is crucial to re-analyze the site using Google’s PageSpeed Insights tool. This will allow you to assess the impact of the changes and verify if the CLS score has improved. If further optimization is required, the tool will provide additional recommendations to fine-tune the CLS.

Monitoring the site for upcoming CLS issues

Fixing CLS issues is an ongoing process, as updates to the website can introduce new elements and potentially impact CLS. It is important to continuously monitor your WordPress site for any upcoming CLS issues. Regularly checking the CLS score, analyzing user feedback, and staying informed about new optimization techniques will help you maintain a positive user experience and minimal layout shifts.

In conclusion, CLS is an important metric that affects the visual stability of your WordPress site. By understanding the factors contributing to CLS issues, using tools to identify and resolve them, and implementing optimization techniques, you can greatly enhance the user experience and improve the performance of your website. With the right strategies and plugins, you can effectively mitigate layout shifts and ensure a smooth and visually appealing browsing experience for your users.

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