gsap-performance: Скилл оптимизации анимаций и FPS

--- name: gsap-performance description: Official GSAP skill for performance — prefer transforms, avoid layout thrashing, will-change, batching. Use when optimizing GSAP animations, reducing jank, or when the user asks about animation performance, FPS, or smooth 60fps. license: MIT --- # GSAP Performance ## When to Use This Skill Apply when optimizing GSAP animations for smooth 60fps, reducing layout/paint cost, or when the user asks about performance, jank, or best practices for fast animations. **Related skills:** Build animations with **gsap-core** (transforms, autoAlpha) and **gsap-timeline**; for ScrollTrigger performance see **gsap-scrolltrigger**. ## Prefer Transform and Opacity Animating **transform** (`x`, `y`, `scaleX`, `scaleY`, `rotation`, `rotationX`, `rotationY`, `skewX`, `skewY`) and **opacity** keeps work on the compositor and avoids layout and most paint. Avoid animating layout-heavy properties when a transform can achieve the same effect. - ✅ Prefer: **x**, **y**, **scale**, **rotation**, **opacity**. - ❌ Avoid when possible: **width**, **height**, **top**, **left**, **margin**, **padding** (they trigger layout and can cause jank). GSAP’s **x** and **y** use transforms (translate) by default; use them instead of **left**/**top** for movement. ## will-change Use **will-change** in CSS on elements that will animate. It hints the browser to promote the layer. ```css will-change: transform; ``` ## Batch Reads and Writes GSAP batches updates internally. When mixing GSAP with direct DOM reads/writes or layout-dependent code, avoid interleaving reads and writes in a way that causes repeated layout thrashing. Prefer doing all reads first, then all writes (or let GSAP handle the writes in one go). ## Many Elements (Stagger, Lists) - Use **stagger** instead of many separate tweens with manual delays when the animation is the same; it’s more efficient. - For long lists, consider **virtualization** or animating only visible items; avoid creating hundreds of simultaneous tweens if it causes jank. - Reuse timelines where possible; avoid creating new timelines every frame. ## Frequently updated properties (e.g. mouse followers) Prefer **gsap.quickTo()** for properties that are updated often (e.g. mouse-follower x/y). It reuses a single tween instead of creating new tweens on each update. ```javascript let xTo = gsap.quickTo("#id", "x", { duration: 0.4, ease: "power3" }), yTo = gsap.quickTo("#id", "y", { duration: 0.4, ease: "power3" }); document.querySelector("#container").addEventListener("mousemove", (e) => { xTo(e.pageX); yTo(e.pageY); }); ``` ## ScrollTrigger and Performance - **pin: true** promotes the pinned element; pin only what’s needed. - **scrub** with a small value (e.g. `scrub: 1`) can reduce work during scroll; test on low-end devices. - Call **ScrollTrigger.refresh()** only when layout actually changes (e.g. after content load), not on every resize; debounce when possible. ## Reduce Simultaneous Work - Pause or kill off-screen or inactive animations when they’re not visible (e.g. when the user navigates away). - Avoid animating huge numbers of properties on many elements at once; simplify or sequence if needed. ## Best practices - ✅ Animate **transform** and **opacity**; use **will-change** in CSS only on elements that animate. - ✅ Use **stagger** instead of many separate tweens with manual delays when the animation is the same. - ✅ Use **gsap.quickTo()** for frequently updated properties (e.g. mouse followers). - ✅ Clean up or kill off-screen animations; call **ScrollTrigger.refresh()** when layout changes, debounced when possible. ## Do Not - ❌ Animate **width**/ **height**/ **top**/ **left** for movement when **x**/ **y**/ **scale** can achieve the same look. - ❌ Set **will-change** or **force3D** on every element “just in case”; use for elements that are actually animating. - ❌ Create hundreds of overlapping tweens or ScrollTriggers without testing on low-end devices. - ❌ Ignore cleanup; stray tweens and ScrollTriggers keep running and can hurt performance and correctness.