A few things:
1) You have way too much surface area in this map. I assume you couldn't light it because of the MAX_PATCHES error. You can reduce this by scaling textures up, but you really don't need things to be as large as they are right now.
2) The sky isn't flush with the edge of the world, so you have a lot of surface area exposed on the back of the map that should never bee seen. The paint puddle is also not to or below the ground in the pit, so the surface is drawn twice (looks weird, and is slow).
3) You have water at multiple different heights visible. This is really slow, as a reflection must be rendered for each water level.
4) There seems to be little regard for gameplay. I don't see any real strategy or anything that could be used here. Everybody just has to rush across the open bridges.