Cumulative Layout Shift (CLS)

Measures unexpected webpage content shifts.

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​Cumulative Layout Shift (CLS) measures how much a webpage’s content unexpectedly moves during loading, affecting user experience. A good CLS score is 0.1 or less. Common causes include images or ads without specified dimensions, dynamically added content, and late-loading fonts. To improve CLS, always set size attributes for media, reserve space for ads, and ensure fonts load properly. ​

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