Using IS INITIAL on the PROGRAM-ID statement
or
INITIAL compiler option
The IS INITIAL clause on the PROGRAM-ID statement or the INITIAL compiler option
specifies that when
a program is called, it and any programs that it contains will be
entered in their initial or first-time called state.
There is an overhead in initializing all WORKING-STORAGE variables with VALUE clauses. The performance impact depends on the number and sizes of such variables.