loading assets in the scene gradually

dears,
how i can load the current assets in the same level when im walking, just i want a sphere around the player and render what ever it collide with, its the way that i can load a huge full scene to 1 core processor mobile , please help me out

 

http://docs.unity3d.com/Documentation/ScriptReference/Resources.Load.html

?

 

good idea ,
but i was thinking like a sphere that could render what it does collider with and disable render when exit ,
i know the load.resources but i would like something in runtime and much performance