Preloading scene issue

So I've been doing some research on how to preload a scene so it doesn't freeze forever in between scenes. I've looked at LoadLevelAsync as well as enabling models through script only when they are needed. However, I don't think these solutions work for Augmented Reality as models are disabled until the tracker is found anyway.

Basically, I have a 2D menu screen that takes you into an Augmented Reality scene (and back if necessary). It works quickly if you go from the AR scene to the menu, but menu to the AR scene takes up to 20 secs sometimes. Does anyone know how to fix this issue?