One of the key factors in improving your FPS on your maps is breaking the map up into zones which can be rendered separately. If this is not done, the engine will render the whole map at once, while will take much more processing time.
Zones work like virtual rooms; while you are standing within one room, only that room will be rendered. Ignoring for a second what you can see through the door (into other rooms), it is easy to see that only rendering the room you are in will dramatically improve FPS.
A zone actually consists of an invisible box which sits around your room, and fully encompasses as much of it as possible. It is, to all intents and purposes, the room
The view through the doors is covered by
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