Alright, so this map has severe optimization issues.
I loaded it up and tried to see how much of the map you've left as world geometry, and it's way too much.
You also have
NO areaportals. And you're not func_detailing enough.
Lets begin:
This whole structure in the middle:
https://dl.dropbox.com/u/1281220/201...9_00.54.44.jpg func_detail it.
It has too many curved surfaces and small brush platforms and stuff. This thing probably create 60403 visleaves by itself.
https://dl.dropbox.com/u/1281220/201...9_00.55.09.jpg
There is no reason for these to be world brushes.
https://dl.dropbox.com/u/1281220/201...9_00.55.24.jpg
Here is what I think is killing the FPS on this map. You have lights with some flickering render FX. DO NOT USE THESE. They're known framerate killers.
Also you should really func_detail that metal panel....
https://dl.dropbox.com/u/1281220/201...9_00.56.13.jpg
func_detail this entire thing. That curved roof and the single thin pole aren't doing you any favors optimization wise as they are now.
https://dl.dropbox.com/u/1281220/201...9_00.56.57.jpg
As a side note, what is this, and why does the announcer think they're australium when I touch them?
why do you have spawnpoints in that room there to the left.