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Re:GitHub Pages with a custom root domain is slow by tomfanning on Tuesday May 13, 2014 @02:11PM (#7739658)
I don't believe that it is valid per RFC 1034 to set the root domain record to be a CNAME.

I found this out when I asked this question a while back: http://serverfault.com/questions/55528/set-root-domain-recor...

Re:GitHub Pages with a custom root domain is slow by Kudos on Tuesday May 13, 2014 @02:48PM (#7739885)
You should try reading his link.