Significance of ESB Systems and Groups

Hi,
Other than organizing things better what are the true functionalities of ESB Systems and Groups? Having services in seperate systems/groups enables me to deploy them on seperate ESB Instances? Are there any performance benefits by limiting number of services in a System/Group?
Thanks in advance.
Regards,
Rajesh

ESB systems are the lowest level unit of scalability (just made that up). You can apply services in a group to different clusters/rt servers and define different async jms topics to route the message through. So anything in an ESB can be segmented to scale up as needed.

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