昨天上午，Google官方博客正式宣告将网页加载速度列入pagerank算法，之前一些消息一直宣称网页加载速度会影响pagerank，现在google终于在自己的官方博客上宣告了这一消息，同时还提供网页加载速度的一些插件和工具供参考，一些基于firefox的插件都可以帮助你，yahoo开发的yslow（基于firebug），还有google的网站管理员工具，都可以为你的网站速度做一个分析.

原文地址(注：blogspot要翻墙才可以查看)：http://googlewebmastercentral.blogspot.com/2010/04/using-site-speed-in-web-search-ranking.html

原文摘录如下：

You may have heard that here at Google we’re obsessed with speed, in our products and on the web. As part of that effort, today we’re including a new signal in our search ranking algorithms: site speed. Site speed reflects how quickly a website responds to web requests.

Speeding up websites is important — not just to site owners, but to all Internet users. Faster sites create happy users and we’ve seen in our internal studies that when a site responds slowly, visitors spend less time there. But faster sites don’t just improve user experience; recent data shows that improving site speed also reduces operating costs. Like us, our users place a lot of value in speed — that’s why we’ve decided to take site speed into account in our search rankings. We use a variety of sources to determine the speed of a site relative to other sites.

If you are a site owner, webmaster or a web author, here are some free tools that you can use to evaluate the speed of your site:

• Page Speed, an open source Firefox/Firebug add-on that evaluates the performance of web pages and gives suggestions for improvement.
• YSlow, a free tool from Yahoo! that suggests ways to improve website speed.
• WebPagetest shows a waterfall view of your pages’ load performance plus an optimization checklist.
• In Webmaster Tools, Labs > Site Performance shows the speed of your website as experienced by users around the world as in the chart below. We’ve also blogged about site performance.

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