Layout shifts while loading
Effort to fix: Moderate (a few hours)
Why it matters
Content jumping around makes people mis-click and is a Core Web Vitals ranking signal.
How to fix it
Set width and height (or aspect-ratio) on images, videos and ads, reserve space for embeds and banners, and avoid inserting content above existing content.
On WordPress
Cookie banners, ad slots and web fonts are common culprits; reserve their space and use font-display: optional or preload fonts.