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Typical additional latency for CGN?

On Oct 7, 2012, at 4:56 PM, George Herbert <george.herbert at gmail.com> wrote:
> Ancedotally, for users of an e-gadget company's website, cellphone
> company's outbound web proxies, internet games company, and
> image-intensive home furnishings website, the CGNs delivered content
> faster than the main website could, regardless of increasing its
> bandwidth.  Latency problems with the CGNs were less than the main
> websites' latency problems, on the average.
> There were days that was not true, and days we had to re-re-re-reset
> the CGN contents, and the day the @#$#@$% game programmers screwed up
> the CGN calls, but on the whole it was among the least performance
> limiting / impeding features of the sites in question.
> -george
> On Sun, Oct 7, 2012 at 1:47 PM, Tom Limoncelli <tal at whatexit.org> wrote:
>> Have there been studies on how much latency CGN adds to a typical
>> internet user?   I'd also be interested in anecdotes.
>> I've seen theoretical predictions but by now we should have
>> measurements from early-world deployments.
>> Thanks,
>> Tom
>> --
>> Speaking at MacTech Conference 2012. http://mactech.com/conference
>> http://EverythingSysadmin.com  -- my blog
>> http://www.TomOnTime.com -- my videos

Huh?  I had presumed that CGN was Carrier Grade NAT, not a proxy service.  Help me understand.

James R. Cutler
james.cutler at consultant.com