Understand how your CDN's are performing with regards to the number of Hits or Misses !!! Remember, if a browser requests a piece of content and the CDN has it cached, then it will deliver that content. This is referred to as a cache hit. However, if the content is not available on the Cache Server(s), then the CDN makes the request back to the Origin server, this is classified as a cache miss. You want cache hits, NOT misses