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A comment on GitHub Pages with a custom root domain is slow. Parent comment

Re:GitHub Pages with a custom root domain is slow by ninkendo on Tuesday May 13, 2014 @03:38PM (#7740178)
So the answer to the issue is that the IP github tells you to use is the slow one? That sounds strange.

What's to stop users from doing their own lookup, and setting their A record to what the result is?

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Re:GitHub Pages with a custom root domain is slow by shawnz on Tuesday May 13, 2014 @04:58PM (#7740665)
I believe the reason is that the *.github.io hosts point to a CDN rather than just having a single A record, and it is only when going through the CDN that you bypass the "neutering". Regarding your second question, it seems that github issues a warning if you do that:

https://news.ycombinator.com/item?id=7738913

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