You can release all objects stored in the PCD (Portal Content Directory) caches:
Shared objects cache (xfs.data) : Contains PCD objects that are shared among different portal users, such as roles, pages, and iViews.
User objects cache (xfs.user) : Contains objects that store user-specific personalization data. One object exists per user at this caching level.
Use this option for support or for development purposes.
The cache release operation may impact system performance while the operation is taking place.
Make sure PCD content is not being edited during this operation because this may cause inconsistencies in the PCD.