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Well, then either the CDN provider used sucks, or you simply are one of the very small percentage that your single-location provider happened to be closer than the CDN provider's closest location.
Basically, could be you were downloading from a local provider for your single-location test, and going across country (which shouldn't happen of course) for the CDN test.
Also could be the CDN provider is overloaded in that location, seeing technical issues, etc.
Basically, what you describe doesn't make any sense from a technical angle. While it happens on the small scale, on the large scale CDN very much speeds things up for the huge majority of your traffic.
Take a look at Youtube - their "hot" content is CDN'ed, and their "cold" content is not. The cold content here (on comcast) is slow as hell, in comparison to CDN.
It would certainly be interesting to see the metrics and methodology used for the testing though, as it may shed some light on the underlying reasons.
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