There’s no question WAN optimization is a vital tool that IT managers rely on to ensure their networks deliver the best performance possible to branch offices and remote users. The growth of software as a service and other cloud-delivered services means organizations have to keep their networks running in top-notch form. WAN performance has to be just as good, if not better, than the internal data network.
Indeed, industry estimates peg worldwide market revenue for the WAN optimization market to reach $12.1 billion by 2019, fueled by market evolution, demand for WAN optimization as a service options, and the continued growth of IP and Ethernet services. 
 by Diana Hwang for Search Networking