Paloth, this could be due to a scaling factor. maybe you are trying to populate too big an object with very small instances.

I used the Poser import of a human-sized figure to set the scale by which all other obj. imports were adjusted, including the leaf blobs. My leaf blobs are just low poly obj. imports from Modo that serve as roofs for the buildings and as an invisible support for the eco system leaves. The blobs are much smaller than most terrain objects would be, a dozen yards or so in this instance.  

Vue froze 10 times in about 15 minutes while I was painting bushes onto one of the blobs. I eventually got the object painted, but decided that the leaves were actually too big for the model. The eco system will actually need to be scaled down a bit.

I have an ATI Radeon 3850, Windows XP 64-bit.  

 

Download my free stuff here: http://www.renderosity.com/homepage.php?page=2&userid=323368