Some (few hundred megabytes) scenes take 1-2 minutes to load, and the user gets no feedback what causes the scene to load so slow.
Current feedback behavior:
Resetting scene - 0-2% : 1-5 seconds
Loading scene data - 2-68% : ~5 seconds
Finalizing load - stuck at 69% : 30-60 seconds
Updating views, etc.: 70-100% : ~2 seconds

It would be helpful to know what happens during "finalizing", which takes up most of the loading time, so if someone swithches between scenes frequently, then they could optimize the scenes by knowing what causes slow loading times.