gsap-performance

Name: gsap-performance
Author: greensock

bygreensock· 8 skills

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How to install gsap-performance?

greensock/gsap-skills/gsap-performance

$npx -y skills add greensock/gsap-skills --skill gsap-performance

Installs into the current project.

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Use this skill

Run `npx skills use "https://github.com/greensock/gsap-skills" --skill "greensock/gsap-skills/gsap-performance"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.

Use the whole pack

Use the skills in "https://github.com/greensock/gsap-skills" that are relevant to the current task. Run `npx skills add "https://github.com/greensock/gsap-skills"` and select the relevant skills, then follow their instructions.

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SKILL.md

1	# GSAP Performance
2
3	## When to Use This Skill
4
5	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.
6
7	Related skills: Build animations with gsap-core (transforms, autoAlpha) and gsap-timeline; for ScrollTrigger performance see gsap-scrolltrigger.
8
9	## Prefer Transform and Opacity
10
11	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.
12
13	- ✅ Prefer: x, y, scale, rotation, opacity.
14	- ❌ Avoid when possible: width, height, top, left, margin, padding (they trigger layout and can cause jank).
15
16	GSAP’s x and y use transforms (translate) by default; use them instead of left/top for movement.
17
18	## will-change
19
20	Use will-change in CSS on elements that will animate. It hints the browser to promote the layer.
21
22	```css
23	will-change: transform;
24	```
25
26	## Batch Reads and Writes
27
28	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).
29
30	## Many Elements (Stagger, Lists)
31
32	- Use stagger instead of many separate tweens with manual delays when the animation is the same; it’s more efficient.
33	- For long lists, consider virtualization or animating only visible items; avoid creating hundreds of simultaneous tweens if it causes jank.
34	- Reuse timelines where possible; avoid creating new timelines every frame.
35
36	## Frequently updated properties (e.g. mouse followers)
37
38	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.
39
40	```javascript
41	let xTo = gsap.quickTo("#id", "x", { duration: 0.4, ease: "power3" }),
42	yTo = gsap.quickTo("#id", "y", { duration: 0.4, ease: "power3" });
43
44	document.querySelector("#container").addEventListener("mousemove", (e) => {
45	xTo(e.pageX);
46	yTo(e.pageY);
47	});
48	```
49
50	## ScrollTrigger and Performance
51
52	- pin: true promotes the pinned element; pin only what’s needed.
53	- scrub with a small value (e.g. `scrub: 1`) can reduce work during scroll; test on low-end devices.
54	- Call ScrollTrigger.refresh() only when layout actually changes (e.g. after content load), not on every resize; debounce when possible.
55
56	## Reduce Simultaneous Work
57
58	- Pause or kill off-screen or inactive animations when they’re not visible (e.g. when the user navigates away).
59	- Avoid animating huge numbers of properties on many elements at once; simplify or sequence if needed.
60
61	## Best practices
62
63	- ✅ Animate transform and opacity; use will-change in CSS only on elements that animate.
64	- ✅ Use stagger instead of many separate tweens with manual delays when the animation is the same.
65	- ✅ Use gsap.quickTo() for frequently updated properties (e.g. mouse followers).
66	- ✅ Clean up or kill off-screen animations; call ScrollTrigger.refresh() when layout changes, debounced when possible.
67
68	## Do Not
69
70	- ❌ Animate width/ height/ top/ left for movement when x/ y/ scale can achieve the same look.
71	- ❌ Set will-change or force3D on every element “just in case”; use for elements that are actually animating.
72	- ❌ Create hundreds of overlapping tweens or ScrollTriggers without testing on low-end devices.
73	- ❌ Ignore cleanup; stray tweens and ScrollTriggers keep running and can hurt performance and correctness.

6 picks

Type

Run `npx skills use "https://github.com/greensock/gsap-skills" --skill "greensock/gsap-skills/gsap-performance"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.

Use the skills in "https://github.com/greensock/gsap-skills" that are relevant to the current task. Run `npx skills add "https://github.com/greensock/gsap-skills"` and select the relevant skills, then follow their instructions.

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