Connection Thread Settings and Performance
When many peer processes are started concurrently, you can improve the cluster connect time by setting the p2p.HANDSHAKE_POOL_SIZE system property value to the expected number of members.
This property controls the number of threads that can be used to establish new TCP/IP connections between peer caches. The threads are discarded if they are idle for 60 seconds.
The default value for p2p.HANDSHAKE_POOL_SIZE is 10. This command-line specification sets the number of threads to 100: