What are 'Optimized jarfiles' ?

[Stanley Bradbury]

Am reviewing the Getting Started Guide and found a reference to 
'optimized jarfiles' in the LIB distribution. Is this wrong or do the 
jarfiles in LIB now differ from the BIN distribution?

The distributions are:
• The bin distribution contains scripts, demonstration programs, and 
documentation.
The optimized jar files are available in the lib distribution.
• The lib distribution contains an optimized, small footprint set of the 
Derby jar files for
deployment.