I think you should use PCoIP. It is build specially for WAN connections. It has many inbuilt features that will help in network consumption and usage. The below text is form PCoIP Network Optimization Guide
- Strengths of the PCoIP Protocol
PCoIP is a real-time protocol based on the User Datagram Protocol (UDP). UDP provides no resiliency facilities at the network layer. Instead, PCoIP provides resiliency at the application layer. The real-time nature of the protocol means that PCoIP makes the decisions about which data is important, and which data can be discarded. The protocol is therefore very responsive, but anything that may induce packet loss or add latency must be eliminated for optimal performance.
PCoIP automatically reduces image or sound quality on congested networks, and resumes best quality when congestion is alleviated. PCoIP is adaptive and can detect available network bandwidth and network conditions, such as delayed or out-of-order packet delivery. When these conditions reach a particular threshold, PCoIP compensates by limiting how much bandwidth it uses or by increasing compression depth. You need to make sure the network is optimized so that PCoIP does not adjust itself down to a level with unsatisfactory quality. PCoIP requires minimal and consistent latency and high-priority queuing to perform well.
There are a number of tuning options for optimizing performance on a WAN including: • Ensuring sufficient minimum network bandwidth for PCoIP packets
• Minimizing packet buffering for PCoIP packets through the network
• Ensuring an appropriate queuing or priority configuration in the switch or router• Following key WAN testing guidelines