Testing for Speed Optimization Opportunities
We recommend running multiple tests through a service like webpagetest.org so one may test both different browsers and connection speeds. Testing only through analytics doesn't give the whole picture because analytics doesn't let you know what services may be slow or files or what kind of internet connections or locations users are connecting from.
Our speed optimization service employs many recommended 'best practices' set forth by Google page speed insights. There are, however, some elements we can't adjust (yahoo's image urls and 3rd party scripts). Without a doubt the caching is better and files are served faster on our CDN (akamai) than Yahoo's files or many others. We recommend doing multiple tests with various services (google page speed, webpagetest.org - do get many variations, pingdom, etc) to see where opportunities for better and more efficient page loads exist.