Here is a neet trick to load a lot of trees without using a lot of memory. The basic idea is to make an image of the tree, and paste it into a Poser square along with a transparency map.

In an empty Poser document, hide the GROUND and set the background colour to black. Load your tree, do a render, export an image in TIF format, name it "MyTree".

These are instructions for Poser 4, and PaintShop Pro 5, but you should be able to do a simmilar thing in most paint programs.

Load the MyTree.tif in PSP5, load the mask from the alpha channel. Invert the mask. Save this image as MyTree_TRAN.tif". You might want to convert the final images to JPEG format and use some compression to get smaller files.

Open Poser Load a Poser square prop. Set the Highlight Color to black, set the Highlight Size to 1%, set Transparency Min and Max to 100%.

Load MyTree.tif as the texture and MyTree_TRAN.tif as the Transparency Map, click OK. Resize the square as appropriate, and save it to a props pallet. You now have one light weight "Billboard" tree, you can load many of these without using a lot or resourses.

Of course you won't be able to see it properly untill you render.