Lightmaps texture streaming problem with oculus rift

I guys! I have a problem with lightmaps… I have static meshes and static lights in my scene, but when I play the game lightmaps textures aren’t fully loaded. One solution is set each texture lightmaps with ‘never stream’ setting but I play with 5 fps maybe… I have already set ‘streaming pool size’ with 4 gb (nvidia 970) Anyone can help me please??? Thanks guys and sorry for the English!