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Choose the simplest animation tool that fits
CSS, WAAPI, and JavaScript are not automatic fast-versus-slow choices. CSS and JavaScript animations may both be sampled on the main thread; eligible CSS or WAAPI animations can be composited under supported conditions. The visual work matters too: layout or painting can cost more than calculating an interpolated value.
| Approach | Best fit | Limitation |
|---|---|---|
| CSS transitions or keyframes | Small, self-contained effects between known states, such as hover, focus, or an open/closed visual change. | CSS does not guarantee off-thread execution. Property choice still determines layout, paint, and compositing work. |
| Web Animations API (WAAPI) | Imperative control of browser animations, playback, and timing. | Acceleration depends on browser support and the properties animated; complex physics or application logic may require JavaScript. |
| Motion for React | Declarative choreography, gestures, and enter/exit lifecycle patterns in React. | Motion describes its engine as hybrid: features such as spring physics and gesture tracking can fall back to JavaScript. That is a vendor description, not an independent benchmark. |
Custom requestAnimationFrame loop |
A custom simulation or DOM/canvas effect requiring per-frame logic. | The callback runs on the main thread. It must be short, time-based, cancellable, and carefully scoped. |
For Motion’s current React API, components are imported from motion/react. See Motion for React: Get started for its API and the maintainer’s description of the hybrid engine.
Animate properties that avoid unnecessary rendering work
A browser typically calculates layout, paints pixels, and composites layers. Changing height, width, or other layout-affecting values can require layout followed by painting and compositing. transform and opacity are broadly compositor-friendly starting points for movement and fades, though no property guarantees acceleration in every browser or situation. Paint cost and acceleration for other properties vary. Motion’s animation performance guide explains this rendering model.
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- Use
transformto move, scale, or rotate an element when that produces the intended appearance. - Use
opacityfor fades rather than changing a layout property solely to create a visual effect. - If layout animation is necessary, keep the animated region and affected subtree small, then profile it on lower-powered devices.
will-change may encourage the browser to create a layer, but layers use GPU memory. Apply it sparingly to elements that need it, rather than globally.
Keep purely visual frame updates out of React state
React state is appropriate when an animation changes application meaning or structure—for example, whether a panel is open. But if a value changes every frame only to move pixels, routing each update through component state can add JavaScript work and reconciliation without helping the application’s semantics. Where appropriate, let CSS, WAAPI, or an animation library update the visual output, while React handles meaningful state transitions. Profile the component tree before refactoring: the benefit depends on the work the application actually performs.
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React’s useTransition marks updates as non-blocking so React can prioritize other work. It can help with an expensive UI update associated with an interaction; it does not move arbitrary animation callbacks to a worker or compositor. See the React useTransition reference.
Use requestAnimationFrame for custom loops
For custom per-frame work, use requestAnimationFrame rather than guessing a cadence with setInterval. MDN describes it as a request for the browser to call a supplied callback before the next repaint. The callback is one-shot, so schedule another frame only while work remains.
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- Record the start time and use the callback’s timestamp to calculate elapsed time and animation progress.
- Keep each callback short. Batch DOM reads before writes where possible, and avoid forcing synchronous layout.
- Schedule the next frame only if the animation is still in progress; cancel or stop scheduling when the effect is no longer needed.
Using the timestamp makes an animation’s speed independent of display refresh rate. MDN documents common examples including 60 Hz, 75 Hz, 120 Hz, and 144 Hz displays; these are examples, not a guarantee about a particular user’s device. Most browsers pause animation-frame callbacks in hidden tabs and hidden iframes. Consult MDN’s Window: requestAnimationFrame() method reference for scheduling and timing details. For a simple interpolation, CSS or WAAPI is usually preferable to maintaining a custom loop.
Respect reduced-motion preferences
Offer a reduced-motion alternative for non-essential movement, while keeping the control’s state and meaning clear. CSS can respond to the prefers-reduced-motion media feature; libraries may provide equivalent support. MDN documents the feature in its prefers-reduced-motion CSS media feature reference.
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Profile the rendered result, not just the code
Use browser performance tools to inspect long tasks, style recalculation, layout, paint, dropped frames, and compositing. Test representative scenes in the browsers and on the lower-powered devices your audience uses: compositor eligibility and rendering behavior vary by property and platform. A library’s performance claims are not a substitute for measuring your own interface.
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- Check whether the animation triggers layout or paint, not only whether its timing code is JavaScript or CSS.
- Look for unrelated React work occurring during the animation before moving values out of state.
- Verify the reduced-motion experience and test the interaction in the actual target browser set.
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