I have read through the infamous HL2 optimization guide many times. I am having a problem though. When I am using 'mat_wireframe 1' Every brush in my map is being drawn. So I decide to throw in some hint brushes to make sure my leafs break up visibility. No change! Then I decide to make a test map to test some things out. Even in my simple test map with hint brushes everything is being drawn. Here are some pics: Overview of map with hint brushes. Celing removed for the pic. In game shot of eveything being rendered. I am trying to optimize as I go along with my new map but I can't understand why Everything is always being rendered. Thanks for your help.