I just checked it with one of my characters. If I create a pz2 out of Poser from my char with All morphs injected, the file size is 699 kB, with IPB and the zeroed channels excluded the filesize is only 14 kB each the INJ and the REM file. Without excluding the zeroed (unused) morphs the filesize is about 102 kB. Both files, build with IPB don't need the pre injection of the morphs and only the needed morphs are loaded into the figure.

Just an example:

{
version
    {
    number 4.01
    }
    // Generated with DAZ INJection Pose Builder (IPB) v1.5
    // This file is intended for use with Victoria 4.2

    // --- Delta Includes ---
    readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:Morphs++:InjDeltas.FBMVoluptuous.pz2"
    readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:Morphs++:InjDeltas.PBMInhale.pz2"
    readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:Morphs++:InjDeltas.PBMBreastsSize.pz2"
    readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:Morphs++:InjDeltas.PBMBreastsLarge.pz2"
    readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:Morphs++:InjDeltas.PBMBreastsImplant.pz2"
    readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:Morphs++:InjDeltas.PBMBreastsNatural.pz2"
    readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:Morphs++:InjDeltas.PBMBreastsDroop.pz2"
.
.
.
.
.
actor BODY
    {
    channels
        {
        valueParm FBMVoluptuous
            {
            keys
                {
                k 0 0.168
                }
            }
        valueParm PBMInhale
            {
            keys
                {
                k 0 0.292
                }
            }
        valueParm PBMBreastsSize
            {
            keys
                {
                k 0 0.816
                }
            }
        valueParm PBMBreastsLarge
            {
            keys
                {
                k 0 0.072
                }
            }
        valueParm PBMBreastsImplant
            {
            keys
                {
                k 0 0.292
                }
            }
        valueParm PBMBreastsNatural
            {
            keys
                {
                k 0 0.228
                }
            }
.
.
.
.

    }

actor lShin
    {
    channels
        {
        targetGeom JCMKneeBendL
            {
            keys
                {
                k 0 0.020
                }
            }
        }
    }
}

---

Ulli

"Never argue with an idiot. They drag you down to their level and beat you with experience!"