Using will-change with Animated SVG
will-change hints the browser to prepare optimizations in advance for properties about to change, reducing animation jank.
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How will-change Helps SVG Animations
Applying will-change: transform or will-change: opacity to an SVG element about to be animated hints the browser to promote that element to its own compositing layer in advance, avoiding a sudden layer creation cost right as the animation begins, which can otherwise cause a visible stutter.
- will-change hints the browser to prepare a compositing layer in advance
- Avoids a sudden layer creation cost right as the animation begins
- Prevents a visible stutter that can occur without this advance preparation
Avoiding Overuse of will-change
Applying will-change broadly to many elements that aren't actually animating wastes memory by creating unnecessary compositing layers, so the property should be applied selectively, ideally added just before an animation starts and removed afterward, rather than left permanently on every animated element.
- Applying will-change broadly wastes memory creating unnecessary layers
- Best applied selectively, just before an animation is about to start
- Removing it after the animation finishes avoids permanently wasting resources
Frequently Asked Questions
Should will-change be applied permanently to every animated SVG element?
No, applying it broadly and permanently wastes memory on unnecessary compositing layers — it's best added just before an animation starts and removed afterward.
Which properties benefit most from will-change on SVG elements?
transform and opacity typically benefit most, since these are the properties browsers can most efficiently composite on the GPU when prepared in advance.
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