... so I'm going out on a limb here and guessing that your model is probably some millions of polygons and Poser wasn't made to deal with that. Person probably made it in Zbrush and never bothered to optimize for outside use - you'd sadly have to retopologize it in some program and most methods of automatic retopo aren't really good.

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.