Chrome's field data shows a Cumulative Layout Shift above 0.25 for at least a quarter of real visits: content jumps after it first appears, often just as someone reaches for a link. The page fails Google's Core Web Vitals assessment. The usual causes are images and embeds without reserved space, ads or banners inserted above existing content, and web fonts that reflow text when they load.
An image without dimensions takes up no space until it loads, then pushes everything below it down:
<img src="/photo.jpg" alt="...">
<div id="promo"></div> <!-- banner injected here later -->Reserve space for everything that loads late. Give images width and height (or aspect-ratio), give ad and embed slots a minimum height, and insert new content below the viewport or in response to a user action:
<img src="/photo.jpg" width="800" height="450" alt="...">
#promo { min-height: 90px; }
.embed { aspect-ratio: 16 / 9; }A layout shift is scored when visible content moves without the user asking it to. If the browser knows each element's size before it loads, it lays the page out once and nothing has to move when the content arrives.
This issue can affect your site's search engine rankings and user experience. Addressing it promptly helps ensure optimal performance and visibility in search results.
bseoa automatically checks for this warning during site analysis, along with hundreds of other technical SEO issues.
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