stoopdapoop wrote:yeah, areaportals, hint/skip brushes, func detailing, occluders, and any other kind of visibility control.
Func_detail is especially important for a map like this. Lots of complicated brushwork throughout. I don't think the overall performance would be impacted if you didn't use it, but compiling would definitely take a hell of a lot longer than it should.
I'm not sure if you looked this up yet, but it would be a great guide to read about optimizing your maps:
http://optimization.interlopers.net/index.php