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How to Make Your Website Serve Pages Faster?

I made this list for CNN but it might be useful for any website owner. In the HTML source code on any page, there is a hidden message. CNN Labs team asks for ways to speed up their website.

HTML source code of hides a message

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I am always on the lookout for junk-serving domain names that I can add to my OS hosts file and CNN provided a number of them. Browsing through their source code, I found a message asking for ideas to improve site speeds. The CNN Labs team has already implemented several speed improvement techniques such as CDN, DNS prefetching, aysnc loads, and code minifying, and were interested in anything developers curious enough to look into their code could provide. Here are a few that I came up with: