I'm wondering why you used such a high rez figure as V4 to put in that casket. All you can see of her is a silhouette anyway. You might as well use one of the low rez characters (even the low rez Poser 2 figures would do I think)

Sometimes it also helps with memory if you turn off any bodyparts that can't be seen (covered in clothing) - for some reason it makes Poser think they aren't there at all.

Are you planning to print this? Otherwise there's no need to use anything but the default 72dpi - that may also save you some overhead.

Postworked shadow are rarely going to look as good as real ones. And raytraced shadws doesn't take up much memory. It increases rendertime (sometimes) but the benefit is they look nice AND fall where they're supposed to. I'd put one omni light as the sun and a orange-y point light where your explosion is. That would make nice and believable shadows :)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.