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Using BigMemory with standalone Ehcache improves the performance of individual nodes. When distributing Ehcache in a Terracotta cluster, you can substantially boost the performance of both individual nodes and the cluster as a whole by using BigMemory on every node.
To learn about using BigMemory with distributed Ehcache, see Ehcache With BigMemory.
To learn about using BigMemory in the Terracotta Server Array, see Using BigMemory With the Terracotta Server Array.