Cluster Performance tuning docs

Document suggestions for increased performance in a cluster.

Off the top of my head, I'm sure there are others, in no particular order:

1) Adjust UDP buffer kernel defaults.
2) Buddy replication for session use case.
3) Separate transport for high load channel.
a) Bundling enabled for async use case; udp-async stack
4) No FC for synchronous use case; udp-sync stack.
5) Shorter cluster names.
6) Remove cache loader config from web session cache if not using passivation.
7) TCP for smaller clusters???