Well. What I have changed: -Your map inside of the skybox is changed, now the skybox is how it should be, and that means you can make your 3d skybox (IF YOU KNOW HOW, I can do it for you if you want); -Optimized with occluders and func_details; -Optimized with trigger_transition (will do hints in your map which is very helpful); -I "fixed" the thing with your water shit. (Wig told you WRONG so far...); -Made a better view for your corridor thing... eeh... dont even know what is it xD; -Added cubemaps for the place where it requires to have it (height, width, large from the textures, in other words gave them the right reflection); -Your textures were very messy. I put them right so they fit well.