vvis problem

[The_Gl!tch.exe]

I'm currently working on a new trade map and I have the problem that the vvis takes too long when compiling (~50 mins)
I've also noticed the map has a bigger file size than the other maps I've made.
I don't know what causes it and how to fix it. I've already used cheap water textures.
Here's the map download:
http://www.mediafire.com/file/p2so5svh8nb1d34/trade_island_a1__vvis_problem.zip/file
All "custom" models and textures there are from the tf2maps packs and from crash's mapping tutorial

It would be awesome if someone could check it out and find the problems I couldn't find. I've also checked the compile log.
And the map isn't even finished yet...

 

[Da Spud Lord]

When I loaded up your map, the first thing I noticed was a total lack of func_detail anywhere within the map. You've got a lot of small geometry that's not blocking visibility at all, which would make great candidates for func_detailing. (I recommend you go back and rewatch Crash's tutorial on func_detail.)

Additionally, you've got lots of wide, open space in your map. Placing func_viscluster entities in open, unobstructed areas can greatly reduce compile times while sacrificing no performance.