Core Web Vitals for Motion-Heavy Websites

Animation should not block the content

Motion can help explain a product, but it should not delay the page's meaning or controls. Reserve space for media, set image dimensions, load important fonts efficiently and avoid long intro sequences that prevent visitors from reaching the site.

Use transforms and opacity for simple transitions where possible. Avoid repeatedly measuring layout and writing styles in the same frame.

Treat scroll animation as a budget

A page with dozens of independent scroll triggers, video scrubbing and large canvases can become expensive on mid-range phones. Scope triggers to the relevant section, clean them up on unmount and refresh measurements after layout changes.

• Avoid animating layout properties on every frame.
• Use scrub only when motion genuinely follows scroll.
• Reduce decorative rendering on constrained devices.
• Respect prefers-reduced-motion and keep content visible.

Measure on real devices

Use field data and lab tests together. Watch Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift, then profile slow interactions and scroll jank. A smooth desktop preview is not proof of a smooth mobile experience.