Gary Illyes from Google responded to a question in the Google Webmaster Help forums about hosting your content on a CDN, content delivery network.
The question was why did Google assign a special crawl rate to his site.
Gary from Google said, Google may assign content hosted on a CDN with a special crawl rate. He specifically said you should most likely never increase the crawl rate manually if you are on a CDN, at best, leave it for Google to decide. You can lower the crawl rate, but do not increase it.
Gary from Google explained:
More on CDNs and SEO:
Amazon Elastic Load Balancing & SEO Considerations
Does Google Index Content in “The Cloud” (Amazon S3, etc)
More Tips From Google On Content On CDNs
Google On Content Delivery Networks & Search Rankings
Should You Host Images On Your Domain or Flickr For Best Traffic Potential?
Forum discussion at Google Webmaster Help.
