One thing I was always very regretful about when it came to this map was how little it makes use of dynamic reflections.
I resolved myself to use expensive water even knowing that no amount of optimisation can make it NOT a huge performance sink, but then I didn't even really frame any scenes with the idea of making the water reflect something cool.
On top of that, the scale of the water texture is so low that the reflection is often hard to even make out. I used to have it higher, but someone complained about it being too large so I was like "alright" and scaled it down.
I may eventually fix this, or create a new map with water.
EDIT: Holy fuck this ENTIRE rock prop is nonsolid