Motion design is expensive. It adds engineering complexity, increases bundle size, and requires careful performance management. The question every client should ask — and most don't — is whether it actually works.
We spent Q3 2024 running controlled A/B tests across 8 client sites, comparing static landing pages to animated variants. The results were clear, with some important nuances.
What Moved the Needle
Scroll-triggered reveals on value propositions increased time-on-page by an average of 34%. Our hypothesis: animation creates a sense of progressive disclosure, encouraging users to keep scrolling to see what comes next.
Hero animations with scroll-driven parallax showed a 22% lift in CTA click-through rates. The effect was strongest on mobile, where the interaction felt more native.
What Didn't
Autoplay video backgrounds reduced conversion on 5 of 8 tests. Users found them distracting rather than engaging. The lesson: motion that requires attention competes with your message. Motion that serves your message reinforces it.
Complex loading animations longer than 800ms showed negative effects on bounce rate. Users who see a complex intro on repeat visits disengage faster than those who see immediate content.
