Of course models are always loaded dynamically in Gamestudio, Friendly Frank was confusing this with multithreading but that is something entirely different. Normally models are only loaded when they become visible to the player, but when you set the variable "preload_mode" to 1 they are already loaded when the level is loaded.

If you dont have the Pro edition it does not matter how you compile the level, it will always be rendered with ABT. But rendering with "Simple Map" is better because then you can have arbitrary geometry, otherwise your geometry must be BSP suited (convex).