Typed vs untyped Parameters

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Untyped parameters
Runtime: 5 microseconds

PERFORM UP1 USING 10 M6-DIMID M6-ZAEHL M6-ISOCODE M6-ANDEC M6-PRIMARY.

FORM UP1 USING
               REPEAT
               DIMID
               ZAEHL
               ISOCODE
               ANDEC
               PRIMARY.
* Identical source code left and right:
DO REPEAT TIMES.
   T006_WA-DIMID   = DIMID.
   T006_WA-ZAEHL   = ZAEHL.
   T006_WA-ISOCODE = ISOCODE.
   T006_WA-ANDEC   = ANDEC.
   T006_WA-PRIMARY = PRIMARY.
ENDDO.
ENDFORM.

Typed parameters
Runtime: 2 microseconds

PERFORM UP2 USING 10 M6-DIMID M6-ZAEHL M6-ISOCODE M6-ANDEC M6-PRIMARY.

FORM UP2 USING
            REPEAT   TYPE I
            DIMID    LIKE T006-DIMID
            ZAEHL    LIKE T006-ZAEHL
            ISOCODE LIKE T006-ISOCODE
            ANDEC    LIKE T006-ANDEC
            PRIMARY LIKE T006-PRIMARY.
* Identical source code left and right:
DO REPEAT TIMES.
   T006_WA-DIMID   = DIMID.
   T006_WA-ZAEHL   = ZAEHL.
   T006_WA-ISOCODE = ISOCODE.
   T006_WA-ANDEC   = ANDEC.
   T006_WA-PRIMARY = PRIMARY.
ENDDO.
ENDFORM.

Documentation
If you specify the type for formal parameters in your source code,
the ABAP/4 compiler can optimize your code more thoroughly.
In addition, the risk of using the wrong sequence of parameters in a
Perform statement is much less.