Critical Cumulative Layout Shift
What this means
Measured CLS is above 0.25, the band Google classifies as poor. CLS accumulates every time visible content moves after it has been painted.
How to fix it
Reserve space for images, ads and embeds with explicit width and height (or aspect-ratio) so late-loading elements cannot push content around.
Fix effort
This check needs a developer fix: it turns on a routing, hosting or infrastructure decision that no automatic edit can make safely.
Authoritative source
Find every page this affects
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