Because the Business Process Management product set is written in Java™, the performance of the Java Virtual Machine (JVM) has a significant impact on the performance delivered by these products. JVMs externalize multiple tuning parameters that can be used to improve both tooling and runtime performance. The most important of these are related to garbage collection and setting the Java heap size.
Note: The products covered in this information use Java 6.
The 
IBM® Java 6 Diagnostics Guide provides
information about all the available tuning parameters, most of which
are for specific situations rather than for general use.