This test attempts to determine if your page makes use of a CDN, content distribution network. A CDN allows static content to be stored in multiple geographic locations, so that when the content is requested by a user’s browser it can be retrieved from a location as close as possible to the user. This geographic proximity increases delivery speed and in turn page load speed.
Checking for CDN usage
This test checks to see if any known CDN hostnames are referenced – such as Amazon AWS, Akamai or CloudFront. If no such references are found and there does not appear to be any CDN hostnames in usage, then the test reports a FAIL.
If you receive a FAIL for this test, you should consider using a CDN to speed up static content delivery.
Reference
This test is based on YSlow best practice checklist. See http://yslow.org/faq/ for more details.
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