[linnemann]

If there is a large difference in the ACMI sizes.
Having the boundaries with the smallest faces first in the boundary file will have a drastic effect on speedup.

    ACMI2_couple
    {
        type            cyclicACMI;
        nFaces          16176;
    }
    ACMI3_couple
    {
        type            cyclicACMI;
        nFaces          16176;
    }
    ACMI1_couple
    {
        type            cyclicACMI;
        nFaces          1080;
        }

    ACMI4_couple
    {
        type            cyclicACMI;
        nFaces          1080;
    }

Will use ~1min to do the addressing

    ACMI1_couple
    {
        type            cyclicACMI;
        nFaces          1080;
        }

    ACMI4_couple
    {
        type            cyclicACMI;
        nFaces          1080;
    }
    ACMI2_couple
    {
        type            cyclicACMI;
        nFaces          16176;
    }
    ACMI3_couple
    {
        type            cyclicACMI;
        nFaces          16176;
    }

Will use 5s! to do the addressing....