Took a quick run through of your level Annath and my opinions are...
The only actual error I found is the brush under the barrels near the last point is messed up. It shows as a weird reflection.
My suggestions are...
1.Add a secondary way out of the blue spawnroom. There are many different ways to do this, a path out the back, a second floor, a path under ground etc. If you don't like that you could instead add an entire secondary blue spawnroom on the other side of the hangar, around the corner, out of line of site of the first and approximately the same distance away from the hanger door (trucks can be moved outward to allow a path there). Of course you won't be able to cover the blue spawn via those windows if blue has 2 spawns so I'd go with the first option. I also noticed the invisible brush to prevent grenades going over the fence to land in front of the blue spawn. It's a good idea however you can still shoot grenades over the spawn itself to land (somewhat) in front of the spawn. I'd either extend the brush or remove it. I skew to removing it if you do either of aforementioned ideas.
2.Add more arrow and sign overlays to better indicate which way to go. The map is really
not confusing it's just the a, b, c thing helps people get oriented faster. Like you did on that nice control box, I could tell exactly what it did. I did however sit and wonder at startup exactly where the main hangar door would open (I could tell it was that wall but not exactly where). That door is niffty so I would not change the brush but you may wish to change the texture on the movable parts to indicate which move or something IDK.
3.Add more time gained on the second cap, maybe 3+ minutes? I don't know exactly but you should get more time than the first cap as the closer you get to the enemy spawn the harder it becomes.
4.Replace the red elevator with standard stairs. I know, I know the elevator gets people up little quicker but its also a spawn campers dream. With no way for red to go back down (without getting off the elevator) just about any class can stand at the top and shoot you as you are stuck in the corner (with a sentry there pushing you back it would be hard to get off at all meaning instant death using it). Not to mention the nature of the elevator makes it hard for more than one person to get on it at a time so whoever is at the top will probably be fighting people one at a time.
5.You may also want to add a little more detail. I suggest buildings in the background outside the area of play up top.
I forgot to run +showbuget (and I've got to go to sleep now) so I don't know about optimization but I didn't have any problems. Anyway I like the niffty door, the control box and the general layout looks good. Keep up the good work
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You need to talk to Shagz about getting your map on the server. You may want to post a link to your map here if you have one as well.
We'll reschedule another time.