If SubD is taking to much of your system, try the following:
Render without SubD but instead?

Using the free "scenefixer" script to set crease angle on ALL groups of your figures to 180°.
Set Smoothing to "ON" in the render settings.
Render as such.

Remark.

Using SubD will shrink your object file.
Using Smooth Polygons wil expand your object files.

Going from SubD to Smoothed figures "can" provoke clothing poking as the "size" of the figure increases slightly.

Using SubD at level 1, AND using Smooth Polygons in the render settings with crease angle set at 180° in all groups, will +/- maintain the size of soft body objects like figures.
= no shrinking, no expanding, at the cost of some render time of cource.

Use this trick in 64 bit PoserPro that can use all available RAM.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!