wilsonpage.co.ukThis domain may be for sale!
Optimize CSS Delivery | PageSpeed Insights | Google for Developers
Optimize CSS Delivery Stay organized with collections Save and categorize content based on your preferences. This rule triggers when PageSpeed Insights detects that a page includes render blocking external stylesheets, which delay the time to first render. Overview Before the browser can render content it must process all the style and layout information for the current page. As a result, the brow
ブラウザのしくみ: 最新ウェブブラウザの内部構造 - HTML5 Rocks
How browsers work Stay organized with collections Save and categorize content based on your preferences. Preface This comprehensive primer on the internal operations of WebKit and Gecko is the result of much research done by Israeli developer Tali Garsiel. Over a few years, she reviewed all the published data about browser internals and spent a lot of time reading web browser source code. She wrot
Jank Free: Let's Make the Web Silky Smooth!
What is Jank? Modern browsers try to refresh the content on screen in sync with a device's refresh rate. For most devices today, the screen will refresh 60 times a second, or 60Hz. If there is some motion on screen (such as scrolling, transitions, or animations) a browser should create 60 frames per second to match the refresh rate. Jank is any stuttering, juddering or just plain halting that user
Rendering without lumpy bits - BACON: the conference on things developers love
Right, we've got a new project, we have to calculate and draw 500,000 pixels, and the deadline is in 16.67 milliseconds. When we're done, we'll do it again, and again. Web performance has always been about delivering those pixels on time, but the target has shifted. Optimising pure JavaScript (loops, string concatination, arithmetic) is more irrelevant than ever, performance gains are to be found
DevTools: Visually Re-engineering CSS For Faster Paint Times
February 7, 2013 Increasingly, whether it’s on desktop or mobile, users want their web experience to be snappy and delightful. This means that even if the browser is busy rendering the page or loading in content, the user should still be able to scroll around and interact with it. Animations need to be silky, scrolling must be buttery-smooth and your page needs to contain little to no jank. This c
Jank Busting With Daft Punk
May 16, 2013 Yesterday, I looked at the new Daft Punk web experience on Pitchfork. It was visually stunning, featuring rich-animations throughout. I noticed however that scrolling on the page felt quite janky in Chrome. It was sluggish and stuttered regularly. You could reproduce this by scrolling up and down through the page, something that I struggled with. Paint profiling it with the DevTools,
Avoiding unnecessary paints | Articles | web.dev
Avoiding unnecessary paints Stay organized with collections Save and categorize content based on your preferences. Introduction Painting the elements for a site or application can get really expensive, and it can have a negative knock-on effect on our runtime performance. In this article we take a quick look at what can trigger painting in the browser, and how you can prevent unnecessary paints fr
wesleyhales.com: Adventures with the Skia Debugger
Debugging jank, reflows, etc... The Skia debugger was mentioned a few weeks ago at EdgeConf as a way to examine how the DOM is loaded and processed in the Chromium web browser. Skia is the open source C++ graphics library backing Chromium/Chrome. It comes with a graphical tool used to step through and analyze the contents of the skia picture format. If you haven’t watched this video, I recommend y
Understanding WebKit composite layers and iOS Safari performance – Chris Danford
I'm a computer programmer specializing in games and fitness applications. I’ve made a video showing how Webkit handles animating of CSS3 transforms very differently from animating of CSS position (left, top) or margin. The are several different conditions that will trigger the browser to use a “composite layer” which minimizes repaints and allows for hardware-accelerated composting. The benefits a
Learn web development | web.dev
Stay organized with collections Save and categorize content based on your preferences. Explore our growing collection of courses on key web design and development subjects. An industry expert has written each course, helped by members of the Chrome team. Follow the modules sequentially, or dip into the topics you most want to learn about.
What No One Told You About Z-Index — Philip Walton
The problem with z-index is that very few people understand how it really works. It’s not complicated, but it if you’ve never taken the time to read its specification, there are almost certainly crucial aspects that you’re completely unaware of. Don’t believe me? Well, see if you can solve this problem: The ProblemIn the following HTML you have three <div> elements, and each <div> contains a singl
How (not) to trigger a layout in WebKit
As most web developers are aware, a significant amount of a script's running time may be spent performing DOM operations triggered by the script rather than executing the JS byte code itself. One such potentially costly operation is layout (aka reflow) -- the process of constructing a render tree from a DOM tree. The larger and more complex the DOM, the more expensive this operation may be. An imp
GPU Accelerated Compositing in Chrome
Tom Wiltzius, Vangelis Kokkevis & the Chrome Graphics team updated May 2014 This code is changing due to Slimming Paint and thus there may be large changes in the future. Note also that some class names may have changed (e.g. RenderObject to LayoutObject, RenderLayer to PaintLayer). Summary This document provides background and details on the implementation of hardware-accelerated compositing in C
Profiling long paint times with DevTools' continuous painting mode | Blog | Chrome for Developers
Continuous painting mode for paint profiling is now available in Chrome Canary. This article explains how you identify a problem in page painting time and how you can use this new tool to detect bottlenecks in painting performance. Investigating painting time on your page So you noticed that your page doesn't scroll smoothly. This is how you would start tackling the problem. For our example, we'll
Aerotwist - On translate3d and layer creation hacks
Translate3d is often hailed as something of a silver bullet. In many cases it will drastically improve rendering performance in WebKit and Blink browsers like Chrome, Opera and Safari. Let's take a look at why it can improve rendering performance, and what we need to be careful of. Last updated: 27 Feb 2013 Est. Read Time: 6 min Share this: Twitter Tagged: #layers, #rendering, #hacks The "go faste
Accidental layer creation
Click the box above, it spins, woo! Click somewhere else, it stops, boo! Take a close look at this text when you start and stop the box spinning, it changes ever so slightly, you may have to zoom in to see it. It's losing subpixel antialiasing. This is a symptom of text getting its own texture layer on the GPU. Fire up this page in Chrome Canary, and turn on "Show composited layer borders" in devt
GPUアクセラレーションとposition: relativeによるレイヤー生成について
またアニメーション... ボタンなどのUIにGPUアクセラレーションが効いたアニメーションをつけたとき、iOSにおいてはiPhone4か4SのWebViewあたり、Androidにおいては….まぁ機種依存的(げんなり)に、アニメーションの立ち上がりが遅いことがあります。 その辺を調査していたところ、position: relativeの指定による、意図しないレイヤー生成＆GPUアクセラレーション巻き込みによって、何かしら合成レイヤー周りでオーバーヘッドが発生してしまっているんではないかな、という憶測に行き着いた次第。今回はその辺りを見ていきます。 GPUアクセラレーションが効いたアニメーションは、CSS Animations、CSS Transitionsのほか、特殊なプロパティ（transform3d: scale(1,1)とか）で強制的にGPUアクセラレーションを効かせたCanvasア
Aerotwist - Don't Guess it, Test it!
I recently was invited to give a talk at Spotify in Stockholm, Sweden to the local developer community. My talk centered around performance, since that’s the topic that fills my days at Google, specifically site and application performance. Last updated: 18 Mar 2013 Est. Read Time: 9 min Share this: Twitter Tagged: #perfmatters, #toolsnotrules, #profiling The talk is live so you can watch the vide
リリース、障害情報などのサービスのお知らせ
最新の人気エントリーの配信
j次のブックマーク
k前のブックマーク
lあとで読む
eコメント一覧を開く
oページを開く
http://dl.dropboxusercontent.com/u/70775642/talks/performance/jqueryto/slides/index.html