More than the polygon count normally the amount of (high-res) textures are the biggest problem with Poser imports into Vue. So it is worth thinking of reducing those instead of lowering the polygon count.

One trick to avoid problems maybe is to first import ÜPoser items, save them as vob and then do the actual scene with those vobs. Especially even used as ecosystem with even only one instance in it.

One day your ship comes in - but you're at the airport.