It's thousands of possibilitys... To much loops in one frame... To many polygons to count... - var camera.clip_far is to big - fog_end is to big - wrong LOD system - to complicated models Bad scripting... Bad shadering... Some applications are running in backgroud... Problems with Win... Hardware problems... Drivers problems... ... .... .....
"Try to write entity managers. When you have levels with repeating models everywhere (up to 3-6 dozens identical mesh entities or more), you should conside to replace it by a entity manager which keeps only just 10-25% entities visible max on the screen but when you wander around the entities move to the points whereas you see them."
What would be the best way to go about doing this?