Fw: 深入分析IE9的图片性能测试实例

From: puterjam
Sent: Wednesday, March 17, 2010 5:56 PM
Subject: 深入分析IE9的图片性能测试实例

微软发布了IE9的技术预览版,也放出了不少测试的实例,整体来看给大家带来一支镇定剂。不过舜子这里对其中一个演示案例很感兴趣。

我们先来看看这个实例:点击打开

最让我好奇的是chrome在这个实例中几乎是所有浏览器中最慢的,令人大跌眼镜。

深入分析了这个实例的实现,里面包含其实两部分功能会影响性能,动画的JS算法图片的渲染

测试单纯的动画的算法,把所有图片都block掉。测试得出的结果是,chrome处理256张图片,平均44FPS。而其他浏览器IE7(应为没装IE9,暂时用IE7测试一下),firefox3.6,opera 10.50平均20~22 左右。这说明chrome在纯算法上都是非常有优势的。

这里动画的JS算法并不是最主要的问题了,最大的问题看来是来自对图片的渲染上。仔细看了每一张图片,每张图片都是以一个540×540包括alpha透明的浏览器logo。 看来chrome在渲染大尺寸PNG的时候吃了很大的亏。期待下一个版本的chrome能修复对PNG处理的问题,毕竟这个也是主流的图片格式。

(微软故意挑战chrome的PNG图片)

这里舜子还没有针对IE9进行完整的测试。不过在同事的电脑上测试这个实例时,无疑IE9在渲染上是目前所有浏览器中最快的。而且还有D2D对图片渲染图片在放大和缩小都有抗锯齿表现。

我把这个测试实例down了下来,有兴趣的朋友可以自己测试一下

点击下载此文件

Fw: IE8 如何判断文档模型

From: puterjam
Sent: Wednesday, March 03, 2010 10:29 AM
Subject: IE8 如何判断文档模型

首先给出一组数据

这组数据说明了目前IE8在渲染模式下的一些比例(微软偷偷统计的?)。

● 有19% 的站点用了严格型的标准来设计(非常好的数据,得感谢默默无闻在前线工作的页面重构同学们)

有 14% 的站点用了http头和 X-UA-Compatible 把IE打回IE7的模式
● 有 41% 的站点用了Doctype让IE8使用标准模式(这里指的是,大家常用的过渡型)
● 很不幸还有 26% 的站点使用了Quirks 模式….



下面的图详细得给出了IE8内部对渲染模型的判断流程

更多信息请跳转这里:

Fwd: Biz Stone, Co-founder (@Biz) – Twitter Newsletter 2010 – Edition #1

Hi there,

In the early days of Twitter, I used to send out short updates just to keep everyone in the loop since so much was happening. It's been a while, but you signed up for short, monthly updates from Twitter so we thought it was time to start sharing more information. We've had quite a year. If you haven't visited in a while, we'd like to invite you to come have a look at http://twitter.com — we've been busy!

Growing Up
In the course of a year, registered Twitter accounts have grown more than 1,500% and our team has grown 500%. Recently, we hired our 140th employee! His name is Aaron and he's an engineer focused on building internal tools to help promote productivity, communication, and support within our company. We celebrated with a little dance party.

Features of Note
Some features of note that we released over the course of a year include the ability to create lists, quickly spread information with a retweet button, and an easier way to activate your mobile phone to work with Twitter over SMS. We also built a new mobile web site that looks and works much better on smart phones.

Feeling Inspired
By working together during critical times when others needed help, sharing important information that otherwise might not make the news, and inventing new and interesting ways to use Twitter, you've shown us that Twitter is more than a triumph of technology — it is a triumph of humanity. Projects like Fledgling and Hope140 were inspired by you.

Chirp!
While there may only be 140 full-time employees working at the Twitter offices, there are thousands of dedicated platform developers who have now created more than 70,000 registered Twitter applications creating variety and utility for all of us. We'll be gathering this spring at Chirp, our first ever official Twitter developer conference.

Thanks,
Biz Stone, Co-founder (@Biz)
Twitter, Inc.

30个优秀的博客排版设计

 
 

YinJuan 通过 Google 阅读器发送给您的内容:

 
 

于 10-3-1 通过 UCD博客 作者:a@b.com (tiantong)


博客的设计中有很多优秀的设计不断涌出, 在下面这些博客的设计中,基本包含了所有博客排版的版式,除了简单的结构之外,还有很多质感元素的设计运用! 信息的摄入也非常舒服!大家学习吧!
UCD博客-Comfort Brothers

 
 

可从此处完成的操作: