Have you got the main !DAZ folder (which contains all the deltas) inside the MAIN poser runtime/libraries folder? I'm running P5, and at first I had the !DAZ folder installed in my secondary linked runtime. Take forever that way - P5 needs it to be in the main runtime. I can now load all head morphs in about 2 minutes (used to take forever, as you have found.)

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire