Maple Ranking - Online Knowledge Base - 2025-09-04

What is Cumulative Layout Shift (CLS) and why is it crucial for SEO?

Cumulative Layout Shift (CLS) is a Core Web Vitals metric that measures the visual stability of a webpage by quantifying how much visible elements unexpectedly move during the page loading process. It is calculated by multiplying two factors: the impact fraction (the proportion of the viewport affected by the shift) and the distance fraction (how far elements move relative to the viewport size).

CLS is crucial for SEO because it directly affects user experience and engagement. Unexpected layout shifts can frustrate users, causing difficulty in interacting with the page, leading to higher bounce rates and lower user satisfaction. Google considers CLS as part of its ranking algorithm under Core Web Vitals, meaning a poor CLS score can negatively impact search rankings. Optimizing CLS helps ensure a stable, reliable, and accessible website, which improves both user experience and SEO performance.

A good CLS score is below 0.1, indicating minimal unexpected shifts. Scores between 0.1 and 0.25 need improvement, while scores above 0.25 are considered poor and can harm SEO rankings.

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