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Last update: Dec 16, 2025 Reading time: 4 Minutes
Cumulative Layout Shift (CLS) is a crucial metric in web performance that impacts user experience significantly. Understanding how to implement cumulative layout shift fixes can enhance website stability, reduce user frustration, and improve overall engagement. In this article, we will delve into the definition of CLS, its importance, common causes, and effective solutions to rectify layout shifts.
Cumulative Layout Shift quantifies the visual stability of a webpage. It measures the amount of unexpected layout shifts that occur during the loading of a page, which can negatively affect user interaction. High CLS scores indicate that users may accidentally click links, buttons, or images, leading to a frustrating experience. Aiming for a CLS score of less than 0.1 is recommended for optimal performance.
User Experience: A stable layout is essential as it enhances user experience, making it easier for visitors to navigate your site without unexpected changes.
SEO Ranking: Google has incorporated user experience metrics into its ranking algorithms. Websites with lower CLS scores are more likely to achieve higher rankings in search engine results.
Conversion Rates: Improved layout stability can lead to increased user engagement and higher conversion rates, ultimately benefiting your business.
Understanding the reasons behind layout shifts can help in implementing effective fixes. Here are some common causes:
Images Without Dimensions: If images don’t have defined height and width attributes, the browser can’t allocate space in the layout.
Ads and Embeds: Dynamically added ads or embedded content can cause unexpected shifts if their sizes are not predefined.
Late Loading Fonts: Custom fonts that load late can cause text to reflow, resulting in shifts.
Dynamic Content: Content that loads dynamically post-initial load can alter the layout unexpectedly.
Always specify the width and height for images, videos, and other media content. This helps browsers allocate the correct amount of space during the loading process.
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aspect-ratio for Modern BrowsersFor responsive design, leveraging the aspect-ratio CSS property can help maintain layout stability by letting browsers maintain the intended aspect ratio of elements.
Preloading key fonts can reduce layout shifts caused by text rendering issues. Use the <link rel="preload" as="font"> strategy to enhance font loading speed.
Where possible, prevent adding elements to the DOM after the page initially loads. If dynamic content must be included, ensure that placeholder elements are in place to minimize layout impact.
For ads and other embed codes, reserve specific spaces in the layout. Use predefined height and width attributes to make sure the layout does not shift unexpectedly.
Regularly assess any third-party scripts you integrate into your site. They can introduce layout shifts if not managed properly. Implement lazy loading techniques for non-critical scripts.
To effectively measure and address CLS, utilize these tools:
Google Lighthouse: This integrated tool provides insights into performance metrics, including CLS, allowing you to audit your site easily.
WebPageTest: This platform allows for in-depth performance testing and can help you visualize layout shifts in real-time.
Chrome DevTools: This built-in browser tool enables you to analyze layout shifts during page load directly, making it easy to identify specific elements causing issues.
Implementing cumulative layout shift fixes not only enhances user experience but also aids in improving your site’s SEO and conversion rates. By addressing the common causes and utilizing effective strategies, you can establish a stable and inviting web presence.
If you require assistance in optimizing your website’s performance, including addressing cumulative layout shift issues, reach out to 2POINT. Our expert team is dedicated to ensuring your digital assets perform at their best, leading to higher engagement and success.
What is a good CLS score?
A good CLS score is anything below 0.1. This reflects a stable layout and minimal disruptive shifts.
How do I check my site’s CLS?
You can use tools like Google Lighthouse, WebPageTest, or Chrome DevTools to analyze and measure your site’s cumulative layout shift.
Can CLS affect my SEO?
Yes, Google considers user experience metrics, including CLS, when ranking websites. A lower CLS score can contribute to better search engine rankings.
For further insights into improving your website’s performance, consider visiting our Multi-Channel Marketing and Advertising Services pages. Enhance your strategy with 2POINT today!
