Is there any sizing guide line for Coherence ?

Thanks Robert! It appears we could make a concession and work with unicast UDP (and TCP). Multicast needs to be turned off as leaving it enable has been known to flood our networks and needs to be avoided at all cost.
We are looking for an option to have "the lowest guaranteed delivery of data and events" with consistent low latency so we need a smart use of the available network bandwidth... (general overview goal).
That brings me to the next three topics I am trying to really better understand: serialization options, cache server heap sizes, and scalability boundaries.
Heap Sizes -- It has been suggested in the forums to use 1024m cache server heap sizes (so gc pauses are low enough to "provide" consistent low latencies), and, have 75% of the heap for actual object storage... What are the largest CS heap sizes in production, 4GB, in a 64-bit platform?
Serialization -- I am trying com.tangosol.io.ExternalizableLite and I am interested in quantifying possible gains (i.e. CPU, network bandwidth, storage size impact). Anybody tried their own serialization with better results than ExternalizableLite?
Scalability -- Let's say I go with 1024m CS heap sizes, and my 800 clients (growing rapidly to x4 x6), I will probably end very quickly with a significant amount of cache members. Coherence uses their own "P2P" implementation for their cache topologies (TCMP), right?.. What is the realistic limit in terms of maximum cache member number in a Coherence Cluster? Not sure many clusters connected together can provide the latency/data consistency performance scalable use cases need. Anybody can comment on that (with realistic numbers please). Any benchmarks available with 1,000, 2,000, or 4,000+ members?
Thanks
Martin --

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