I've found that the number of figures is not the main limitation in multi-model scenes. The number of different hi-res textures is what will really throw a load on your system. I'd guess that all of your SML Loris are wearing the same skin Jim? I recently posted this multi figure render in my gallery here with 3 Mikes, 3 Vickys and 3 Possetes in a texture mapped scene with various clothing props and lots of transmaps. Each figure originally used a separate texture map. I'd have added a few Stephs but after I got it to this stage I found that any subsequent figure I added rendered with holes in the figure. Using one texture for all the Vickys was allowing me to add more but I decided I liked what I had anyway and ended up actually dropping one of the Mike textures to make my two Nubians more similar. I'd have needed a shoehorn to fit a Steph in anyway. :o).
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