网站性能认证
我的客户正在寻求绩效审计，类似于年度安全审计。
是否有任何知名的服务或供应商可以测量和分析给定的网站性能，更重要的是验证性能数据。
我的客户的目的是与未来的客户共享这些数据。
My client is looking for performance audit, something similar to yearly security audit.
Are there any reputed services or vendors that measure and analyze a given website performance and more importantly certify the performance data.
My client's intent is to share such data with future customers.
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我建议使用瀑布图来显示性能。我使用过 webpagetest 并且对它非常满意。它也是值得信赖的，因为很多大公司都使用它。
以下是 SO 的运行示例： http://www.webpagetest.org/result/ 111031_H2_21NJR/1/details/
例如，第一个字节的时间为 200 毫秒。这意味着浏览器直到 200 毫秒后才开始渲染任何内容。保留它< 800 毫秒通常是一个好主意。
如果您正在寻找进行此性能测试的公司，我会很谨慎，因为他们都会说“是”，然后访问类似的网站并说这是您的性能分析。
I suggest using a waterfall graph to show the performance. I have used webpagetest and am pretty happy with it. It is is also creditable because a lot of big companies use it.
Here is a sample run for SO: http://www.webpagetest.org/result/111031_H2_21NJR/1/details/
So for example time to first byte was 200 ms. This means that browser doesn't start rendering anything until after 200ms. Keeping it < 800ms is generally a good idea.
If you are looking at companies that do this performance test, I would be cautious because they will all say yes and just go to a similar website and say here is your performance analysis.