This is described in the NCDOCUMENT but we repeat it here.
A session begins by
When you load NCGB it automatically loads NCAlgebra. When you load NCAlgbebra you have a choice of loading many files or huge numbers of files. The default is the latter so you must sit and wait. If you get mad as hell and won’t take it any more, stop. Before loading Mathematica or anything type
This sets an environment where the shorter version of NCAlgebra.m is loaded. Note $NC$LongLoadTime$ =True is the default.