Most layout shift comes from a few shared components, which means you can fix it once instead of page by page.
Where shift starts
Images without dimensions, late-loading banners and fonts that swap size are responsible for the majority of layout shift we measure.
Fixing it in the system
Reserve space for media and embeds, load fonts with matching fallbacks, and keep dynamic banners out of the flow above the fold.
Takeaways
Treat Cumulative Layout Shift as a design-system metric and track it per component.
