这包括在图像、脚本文件、样式表、闪速对象、等的页的URL中使用的主机名。唯一的主机名的数目减少减少DNS查找的数量。
This includes the hostnames used in the page's URL, images, script files, stylesheets, Flash objects, etc. Reducing the number of unique hostnames reduces the number of DNS lookups.
减少DNS查找：只要用户在浏览器的地址栏中键入域名，浏览器总会执行dns查找IP地址，网站拥越多的入口位置，必要的DNS查找也会越多。
Reduce DNS lookups: Whenever a user types in a domain name in their web browser address field, the browser performs a DNS lookup to the IP.
减少DNS查找：只要用户在浏览器的地址栏中键入域名，浏览器总会执行dns查找IP地址，网站拥越多的入口位置，必要的DNS查找也会越多。
Reduce DNS lookups: Whenever a user types in a domain name in their web browser address field, the browser performs a DNS lookup to the IP.
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