In fact, president and CMO of Apparent Networks Jim Melvin called the fact that cloud computing providers can’t or won’t take responsibility for network performance issues once information leaves their data center “one of the big stumbling blocks for the growth of cloud computing in general.”
With the increasing use of SaaS applications and accelerating cloud storage demands driven by users out on the “edge” of your network, the WAN pipe to the Headquarters is increasingly getting clogged.
In addition to edge caching (which will only be helpful for large bulk data transfers but not for live, dynamic, chatty traffic), what may be needed is a dynamic scaling up of edge servers to meet edge user demands in real time.
http://sandhill.com/opinion/daily_blog.php?id=71&post=650