Motion Lexicon
中文
Interactive entry

Perceived performance

Perceived performance helps turn motion judgment into actionable design engineering rules.

Entrances & exitsSequencing & timingMovement & transformsState transitions
ready
Active entry

Preview, parameters, and exports

Perceived performance helps turn motion judgment into actionable design engineering rules.

The right animation makes an interface feel faster, even when it isn't

Browse categories
Preview
Perceived performance
420ms
28px
0ms
soft
.motion-card {
  animation-name: motion-perceived-performance;
  animation-duration: 420ms;
  animation-timing-function: cubic-bezier(0.23, 1, 0.32, 1);
  animation-delay: 0ms;
  animation-fill-mode: both;
  will-change: transform, opacity;
  transform-origin: center;
}

@keyframes motion-perceived-performance {
  from {
    opacity: 0;
    transform: translateY(9px);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .motion-card {
    animation-name: motion-perceived-performance-reduced;
    animation-duration: 180ms;
    animation-delay: 0ms;
    transform: none;
    animation-iteration-count: 1;
  }
}

@keyframes motion-perceived-performance-reduced {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

Agent prompt

Use Perceived performance for a UI fragment: Perceived performance helps turn motion judgment into actionable design engineering rules. Animate transform and opacity, keep the duration at 420ms, use 28px of visual amplitude, add a 0ms delay, use soft easing (cubic-bezier(0.23, 1, 0.32, 1)), and include a reduced-motion fallback.

intent: entrancefeel: softcontext: card
Usage
  • Use Perceived performance while reviewing motion risk.
  • Align designers, engineers, or agents around implementation standards.
  • Turn abstract motion principles into executable checks.
Examples
  • Use Perceived performance to evaluate whether a motion pattern affects comprehension, performance, or comfort.
  • Turn Perceived performance into an explicit review criterion during critique.
Review notes
  • Use Perceived performance as review language instead of relying on vague taste.
  • Check whether it serves orientation, feedback, continuity, performance, or comfort.
  • If it adds friction to high-frequency work, reduce or remove the related motion.
Reduced motion

Under reduced motion, the Perceived performance page keeps the static diagram and text relationships.