I would love to have that texture. Yes, I did have a lot of volumetric lighting, but it didn't look correct so I removed them after the first release. I also removed some sprite based effects from a few other stuff. I'm using hint brushes and areaportals, I use only sin models, which already has lod. I have already gotten a 8 fps boost in the hallways once I edited it. I have also added starfish
Edit: I am also planning on lowering the lightmap scale to 8 for sharper shadows in the hallways, it doesn't really effect performance, because all the calculations are done in the vrad.