Try loading each of the 18 models separately and see which models decrease your FPS the most. Then study those models closer to see the cause.
Press the 'S' key twice in osgviewer and look at how much time is spent culling, drawing, and updating. Some possible causes 1. Too many triangles. 2. Too many different objects sometimes artists seperate their Geometry into to many groups. 3. Not using LODs 4. Too many StateSet changes. 5. Textures use too much memory. 6. And more others Brian
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