Using procedural foliage spawning on my landscape, I’ve noticed it takes somewhere between 5 and 6 seconds for the foliage to finish spawning. Is there a way I can know when this has happened so I can delay my level fade-in by the appropriate duration?
I don’t know of a signal that will say “it’s done!” but I have noticed that if I move the camera a little bit while it’s loading, it’ll load faster.
Not solving your full problem, but at least it may help improve it.
Implement some camera manager that selects a slightly different camera, that you perhaps jitter a little bit, while in the loading mode, to accelerate the process.
Interesting. Maybe I could implement a level fly by for the intro 
Ideally, I’d like to be able to know when it’s completed, but it’s a good idea for a work around.