Thanks for your response.
There is two way of configuring the N Printing connection, First, I put Central node in Proxy address and second I put my load balancing Node address in it:
If i put Central node address, it is far better than putting Load balancing Node address.
I wana know in both of the way my why central node resources are getting consumed so high when I have sync to #3 Load balancing App(Proxy,Engine Services are enabled).
I am attaching the snapshot of N printing connector