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Oct 6, 2020 · To improve the performance of your CSS animations, use the transform and opacity CSS properties as much as possible, and avoid anything that triggers layout or painting.
- Overview
- CSS transitions and animations
- requestAnimationFrame
- Performance comparison: transitions vs. requestAnimationFrame
- Summary
Animations are critical for a pleasurable user experience on many applications. There are many ways to implement web animations, such as CSS transitions/animations or JavaScript-based animations (using requestAnimationFrame()). In this article, we analyze the performance differences between CSS-based and JavaScript-based animation.
Both CSS transitions and animations can be used to write animation. They each have their own user scenarios:
•CSS transitions provide an easy way to make animations occur between the current style and an end CSS state, e.g., a resting button state and a hover state. Even if an element is in the middle of a transition, the new transition starts from the current style immediately instead of jumping to the end CSS state. See Using CSS transitions for more details.
•CSS animations, on the other hand, allow developers to make animations between a set of starting property values and a final set rather than between two states. CSS animations consist of two components: a style describing the CSS animation, and a set of key frames that indicate the start and end states of the animation's style, as well as possible intermediate points. See Using CSS animations for more details.
In terms of performance, there is no difference between implementing an animation with CSS transitions or animations. Both of them are classified under the same CSS-based umbrella in this article.
The requestAnimationFrame() API provides an efficient way to make animations in JavaScript. The callback function of the method is called by the browser before the next repaint on each frame. Compared to setTimeout()/setInterval(), which need a specific delay parameter, requestAnimationFrame() is much more efficient. Developers can create an animation by changing an element's style each time the loop is called (or updating the Canvas draw, or whatever.)
For more details read animating with JavaScript from setInterval to requestAnimationFrame.
The fact is that, in most cases, the performance of CSS-based animations is almost the same as JavaScripted animations — in Firefox at least. Some JavaScript-based animation libraries, like GSAP and Velocity.JS, even claim that they are able to achieve better performance than native CSS transitions/animations. This can occur because CSS transitions/animations are resampling element styles in the main UI thread before each repaint event happens, which is almost the same as resampling element styles via a requestAnimationFrame() callback, also triggered before the next repaint. If both animations are made in the main UI thread, there is no difference performance-wise.
In this section we'll walk you through a performance test, using Firefox, to see what animation method seems better overall.
Browsers are able to optimize rendering flows. In summary, we should always try to create our animations using CSS transitions/animations where possible. If your animations are really complex, you may have to rely on JavaScript-based animations instead.
Aug 30, 2018 · If any of your animations render at less than 60 frames per second, then your visitors will notice, and the user experience will suffer. This guide explains how to keep your CSS and JavaScript animations running smoothly for everyone.
Aug 28, 2024 · How can I improve the performance of CSS animations? Optimizing animation performance involves using hardware-accelerated properties like transform and opacity . Keep animations simple, limit the number of elements animated simultaneously, and test across different web browsers to ensure smooth performance.
Sep 12, 2024 · To achieve smooth animations, we need to reduce the load on the browser and optimize the animation process. 1. Minimize the Number of Animations. Redundant Animations. One of the most significant performance optimization strategies is to minimize the number of animations on your page.
Oct 23, 2020 · Demonstrating how high performance techniques can create complex and beautiful animations.
Apr 3, 2024 · Building competent CSS animations that look awesome not only add the visual interest but they also improve user experience without slacking on the overall site performance.
