This document provides recommendations for performance tuning of IBM Connections 4 Connections based on the experience of the IBM Collaboration Solutions Performance team. However, the optimal tuning and the resulting system capacity can be affected by many factors, including the characteristics of the load on the system and the hardware used, including servers, disk subsystems, network topology, and more. Therefore the recommendations in this document should not be considered the optimal values for every situation, but rather a recommended starting point for tuning a Connections deployment. Using this configuration as a baseline, we suggest monitoring the system performance, making any desired changes, and measuring their impact.
via IBM Connections wiki : Tuning for Performance : IBM Connections 4.0 Performance Tuning Guide.