https://developers.google.com/speed/public-dns/
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http://zh.wikipedia.org/wiki/Google_Public_DNS
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Google Public DNS 是Google面對大眾推出的一個公共免費域名解析服務。而Google表示推出免費DNS服務的主要目的就是為了改進網路瀏覽速度、改善網路用戶的瀏覽體驗
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What is Google Public DNS?

Google Public DNS is a free, global Domain Name System (DNS) resolution service, that you can use as an alternative to your current DNS provider.

To try it out:

Configure your network settings to use the IP addresses 8.8.8.8 and 8.8.4.4 as your DNS servers or Read our configuration instructions.

New! For IPv6 addresses, see our configuration instructions.

If you decide to try Google Public DNS, your client programs will perform all DNS lookups using Google Public DNS.

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個人使用感覺，是稍微加快了一點
中華50M/5M，FireFox 14.0.1