The system limit for deferred processing can be set via the application property curam.dependency.deferred.processing.limit.
While the default for this is set to 50, it should be noted that the true figure for any system will depend on a multitude of factors such as available memory. As a result it is recommended that the value set is based on system testing to find a suitable value that can process most, if not all deferred processes normally, but will move any problematic ones to batch processing.