Performance issue...

[narutohokager]

Hi
So, many of my maps at the launch of the map the game have a lot of lag and after a few seconds later it stops.
I already optimize the level design for all my objects doesnt fall all at once but it's there's still some lag
What should i do ? I looked this link : http://wiki.frictionalgames.com/hpl2/amn...erformance
But I dont inderstand this part "Keep track of your objects" How do I lower the "high poly counts" ?
And this part too, i dont understand... "Make use of corridors"


Thank for futur help