_____ I know for a fact that this loop in particular is using all the time because 1. This is the OSG main loop and is the only thing running (it's single threaded) and 2. If I comment it out my frame rate goes down to jack-diddly. The value of test_load_resolution is only 55. I think you're misunderstanding my question. It's entirely possible that the SLOW CODE isn't taking very much time at all to execute, but the mere act of altering the geometric data is causing OSG to run slower. Removing SLOW CODE would cause OSG to run faster. Because the value of test_load_resolution is only moderate, I suspect this is the case. By default, OSG compiles your geometric data into display lists. This is a fairly expensive operation, but great for static geometry because it only needs to be done once. However, if you change the data every frame, you cause OSG to recompile the display list each frame. That's a guaranteed performance killer. Call setUseDisplayList( false ) on your Drawable and see if that helps your performance. -Paul
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