Performance in CSS - Speaker Deck

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Performance in by Yuya Saito / Rich Media CSS 2014.09.09 @ hikalab

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UX Engineer @ Yuya Saito

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#perfmatters

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Rendering Performance on CSS

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Jank: What is it?

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εΫϩʔϧͷࡍʹͳΜ͔Ҿ͔͔ͬΔ Ξχϝʔγϣϯ͕ΧΫΧΫͯ͠͠·͏

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Parallax!!

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Frame = 16.666666666666666ms 60FPS

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How Browser Render Pixel

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Recalculate Style

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ͦΕ΄ͲେมͳλεΫͰ͸ͳ͍ ϒϥ΢βʹͱͬͯ

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Hello World p { font-weight: bold; } span { display: none; } CSSOM CSS Object Model

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Layout

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গʑ໽հͳ΋ͷ ϒϥ΢βʹͱͬͯ

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DOM + CSSOM = Render Tree

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Paint

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࠷΋ෛՙ͕͔͔Δϓϩηε ϒϥ΢βʹͱͬͯ

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Layout Paint

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Composite

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Ұ୴ফͯ͠ɺࠨʹ10ηϯνͣΒͯ͠ॻ͖௚͢

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GPU Graphical Processing Unit

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Tools, Not Rules

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“ For the most part we’ll be trying to get to 60fps in our work, and that normally means understanding what the browser’s doing and optimizing for it. — Paul Lewis

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“ Tools, Not Rules — Paul Lewis

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chrome://flags/#enable-devtools-experiments

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“ You can't optimize what you can't measure. — Anonymous

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Paint is Very Expensive

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େ͖ͳΤϦΞͷϨΠΞ΢τɺελΠϧແޮԽ

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Ϋϥεͷมߋ ͜ͷཁૉΛมߋ͍ͨ͠

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Ϋϥεͷมߋ

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How to solve it? ճආ

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Ϋϥε/ελΠϧͷมߋ ͜ͷཁૉΛมߋ͍ͨ͠

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How to measure it? ܭଌ

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Layout Thrashing

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// Read var h1 = element1.clientHeight; ! // Write (invalidates layout) element1.style.height = (h1 * 2) + 'px'; ! // Read (triggers layout) var h2 = element2.clientHeight; ! // Write (invalidates layout) element2.style.height = (h2 * 2) + 'px'; ! // Read (triggers layout) var h3 = element3.clientHeight; ! // Write (invalidates layout) element3.style.height = (h3 * 2) + 'px';

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How to measure it? ܭଌ

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Forced Synchronous Layout

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How to solve it? ճආ

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// Read var h1 = element1.clientHeight; var h2 = element2.clientHeight; var h3 = element3.clientHeight; ! // Write (invalidates layout) element1.style.height = (h1 * 2) + 'px'; element2.style.height = (h2 * 2) + 'px'; element3.style.height = (h3 * 2) + 'px';

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by Wilson Page git.io/KdTJYw fastdom

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ϨΠΞ΢τɾϓϩύςΟͷΞχϝʔγϣϯ

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How to measure it? ܭଌ

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How to solve it? ճආ

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www.html5rocks.com/en/tutorials/speed/high-performance-animations

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-webkit-transform: translateZ(0);

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will-change: animateable-feature

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by Sara Soueidan bit.ly/WyKbT7 Everything You Need to Know About the CSS will-change Property

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-webkit-transform: translateZ(0);

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will-change: left, top;

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by Paul Lewis csstriggers.com CSS TRIGGERS...

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by Joel Besada bouncejs.com Bounce.js

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by Julian Shapiro julian.com/research/velocity Velocity.js

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Paint Storms

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Changing visual properties of an element will trigger a paint.

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৭Λมߋ

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Paint!?

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device-pixel-ratio = 1

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positionFixed͕ͳ͍

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How to measure it? ܭଌ

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Show paint rectangles

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Experiments: Paint Proﬁler

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How to solve it? ճආ

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Don't Paint

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www.html5rocks.com/en/tutorials/speed/high-performance-animations

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-webkit-transform: translateZ(0); position: ﬁxed;

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ʰߴՁͳʱϖΠϯτ

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box-shadow border-radius gradient

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Resize Images

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Paint affects not only Animation but also Scrolling

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How to measure it? ܭଌ

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Image Resize is missing?

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How to solve it? ճආ

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CTRL + H

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Images in Performance

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Images are 1MB in 1.7MB

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ߴղ૾౓σΟεϓϨΠ

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by RICG The picture Element picture.responsiveimages.org

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by Andreas Bovens bit.ly/1wdgML0 Responsive Images: Use Cases and Documented Code Snippets to Get You Started

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In Closing

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“ To me, performance is a feature […]. I think there’s also a lesson to be learned here about the competitive landscape of the public internet, where there are two kinds of websites: the quick and the dead. — Jeff Atwood, Coding Horror

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Ϋϥεͷมߋ ͜ͷཁૉΛมߋ͍ͨ͠

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Ϋϥεͷมߋ