
Missing textures here. Also all over your map. Pack your textures with VIDE or CompilePal.
Also, those (and many textures around your map) don't look like TF2 textures.

Resupply?

I don't see any resupply cabinets, despite the signs implying that there are.
Also, notice how I currently have 145 FPS right now (top right corner), staring into the spawn room?

Now I have 21 FPS. Your map is very poorly optimized, likely due to the fact that it's all outdoors, so basically every visleaf can see basically every other visleaf. I also get a warning.
Also, you shouldn't need sentry guns to prevent spawncamping. If you need sentry guns to prevent players from spawncamping in your map, you need to make changes to your map, not try to cover it up with sentry guns. Not to mention that the sentry guns may just tag players that aren't trying to spawncamp, but are simply exploring the map and happen to run past the enemy spawn. Not fun. Additionally, the sound of the sentry guns beeping can confuse players into thinking that there's a legitimate threat nearby that they need to handle.

I can stand up here. Improper clipping.

These roofs aren't even clipped at all.

If not for these sentry guns, I could simply rocket jump into Blu's spawn area.

These large doors open rather slowly.

This Blu spawn exit is useless because the door on the right can only be opened from the outside.

Lotsa tool texture world brushes around your map. You need to make these entities. If they're not brush entities, they just function like world brushes. Check out the
Valve Dev Wiki page on tool textures to make sure you're using these right.

What do any of these buttons do? I've only figured out what one of them does.

You should probably clip this.

LONG.

SIGHTLINES.

EVERYWHERE.

Don't use the skybox as walls.

From this side, the sign looks like there is no sign.

You can't access the inside of most of the buildings due to the tool texture world brushes, but assuming you can access the inside of the building, it's very dark. All of the following screenshots are in fullbright because I otherwise couldn't see anything.

The backside of this staircase is see-through.

Are these stone stairs in an office building?

I finally found the cap point! You should really add more ways to access it though.

I'm standing on the point, yet I can't cap...

These decals disappear as I get closer to them.