Efficient logic in a loop

Hello all,
I have a program where I have logic something like
loop at itab.
   sort itab ascending by prueflos.
    clear   : t_qamr, t_qamv, t_qapo, t_qasr, t_qapp.
    refresh : t_qals, t_qamr, t_qamv, t_qapo, t_qasr, t_qapp.
    CALL FUNCTION 'XYZ'
      EXPORTING
        I_PRUEFLOS    = itab-prueflos
      IMPORTING
        E_QALS        = t_qals
      TABLES
        T_QAMR        = t_qamr
        T_QAMV        = t_qamv
        T_QAPO        = t_qapo
        T_QASR        = t_qasr
        T_QAPP        = t_qapp
      EXCEPTIONS
        LOT_NOT_FOUND = 1
        OTHERS        = 2.
     if sy-subrc = 0.
     endif.
endloop.
The table itab can have duplicate prueflos. I don't want to run the FM XYZ for same inspection lots again and again as this FM takes considerable amount of time to run. For this I sorted the itab ascending by prueflos so that the duplicate prueflos would be one below the other. Now my idea is - if we come accross a duplicate prueflos, use the values t_qamr, t_qamv, t_qapo, t_qasr, t_qapp from previous iteration in the loop.
Could someone put there efficient ideas in. Let me know if something is not clear.
Thanks

Some suggestions.
Do not sort the same itab you are looping inside of your loop. Sort once before you start looping.
After you sort, use
DELETE ADJACENT DUPLICATES FROM itab COMPARING prueflos.
and you'll have unique prueflos to loop through.
sort itab ascending by prueflos.
DELETE ADJACENT DUPLICATES FROM itab COMPARING prueflos.
loop at itab.
    clear   : t_qamr, t_qamv, t_qapo, t_qasr, t_qapp.
    refresh : t_qals, t_qamr, t_qamv, t_qapo, t_qasr, t_qapp.
    CALL FUNCTION 'XYZ'
      EXPORTING
        I_PRUEFLOS    = itab-prueflos
      IMPORTING
        E_QALS        = t_qals
      TABLES
        T_QAMR        = t_qamr
        T_QAMV        = t_qamv
        T_QAPO        = t_qapo
        T_QASR        = t_qasr
        T_QAPP        = t_qapp
      EXCEPTIONS
        LOT_NOT_FOUND = 1
        OTHERS        = 2.
     if sy-subrc = 0.
     endif.
endloop.

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'I may receive some form of compensation, financial or otherwise, from my recommendation or link.'

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Efficient logic in a loop

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