update
I've altered the pillars to appear more solid, and retextured the floor. I've also increased the direct light scale to 3 so direct lighting should be half-again brighter.

I sunk the floor here some. It's also another example of the difference changing the dscale has made.

I've darkened the color of the slime some so it matches the lighting.

I've articulated the floor around the goo-pool and added transparency to the grating.
Predicatably, r_speeds have increased some in the main area, but they are still always under 1200, and rarely reach 1100. However I'm noticing a pretty significant FPS hit and I'm not sure why as I've seen much higher r's rendered on my system without this performance hit. Any ideas?
Is there lag associated with Func_rotating ents or env_shooters?