Alright, you should really listen to the people that are trying to help you, they know what they're talking about.
So I downloaded your map and here is what I see;
-Many overlapped Brushes
-Very complex brushes (heavy on the r_speeds)
-The above combined.
-Over complicated brushes (Those that can be a single brush eg. Some of your walls).
-Incorrect use of Clip brushes.
-Many leaks.
What I recommend
(This is what I would do);
-Scrap this map.
-Have a look over tutorials.
-Learn some basic rules/how r_speeds are calculated.
-Make a very simple map, with very simple brushes.
-Start a Topic in the Mapping section and provide .map file.
-Ask for feedback on your technique in the same topic.
-Once you have your basic techniques down, move on to some harder techniques. Harder brushes. Harder structures, etc.
-In the same topic, update your first post within that topic to include this .map file and ask for feedback.
-Continue this.
-Once you have good technique, making maps that are very well structured, visually appealing and so on will become a breeze!
Well, that's my opinion anyway.
Some tips:
-Use the grid. It's there for a reason. Try not to stray to 1 unit.
-Detailing brushes will help reduce r_speeds.
-Clip brushes are used as 'invisible objects', in the sense that a player can't see it in game, but it will still stop you from going through it. Even though you can shoot through it. (Can't be used as something to block the inside of your map, from the outside of it(will produce a leak)).
-Sky Brushes; These are used to provide lighting and skies to your maps.
I also attached your map, with skies and a full compile done. Just so you know, a full compile won't work if you have leaks, which you did.