Post you render settings please,
and try reducing the bucket to 16.

Rendering in separate process starts FFRender.exe, but under Vista and Win7, it does not have the same reading rights of the Virtual Store as Poser.exe. (do not know for MAC)
With a bucket of 16, (even 8 if needed)  memory load would normally drop, and render faster.

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"!