The best performance occurs when you use only system level libraries. Application selection time increases if you use group and private libraries. However, application selection time is impacted the most when invocation crosses from one application level to another.

To minimize the performance impact, lower-level administrators should copy clusters of applications down to their level. For example, if you copy two or more applications, which are attached to one higher panel, down to a lower level, you should also copy that panel down to a lower level. If you copy several functions that use the same higher-level environment down to a lower level, you should also copy down the environment.