Cumulative Layout Shift (CLS) has become a critical performance metric, as it measures the amount of visual instability that users experience during page load.

While using a well-coded theme and good plugins can help reduce CLS, delaying all JavaScripts or using poorly-coded themes/plugins or third-party embeds can cause significant CLS issues.

To address CLS, it’s recommended to use an automated CLS optimizer, which can analyze the layout of the page and determine which elements are contributing to CLS, and optimize them accordingly. Optimizing CLS manually can be a complex and time-consuming task, but with the help of a CLS optimizer, website owners can quickly improve the user experience of their site.