Every motion should answer a question: where am I, what changed, what is next?
If a motion does not answer one of these, it is decoration — and decoration on the web has a cost measured in milliseconds and trust.
A motion budget, like a byte budget
We size motion the way we size images: with a budget. Every page gets a hero moment, a few micro-transitions, and a hard cap on decorative motion. Everything above the cap has to earn its place.