Hi,
It isn't the scene that is loading slowly - it is the scene deleting. If I load a scene it is pretty okay about a 1minute for complicated scene.
But when I load another scene it hangs on the "Clearing scene" line for a very long time, then loads. The more objects in the scene the longer it takes of course, but never used to take 5 minutes to clear the scenes before upgrading to 4.9
So I have gone to closing and opening Daz instead of loading directly, or using NEW, because it is heaps faster.