Inserting using multiple contexts into LocalDB
I'm not sure i understand exactly why you have multiple contexts. If you keep to one context you can do one SaveChanges(). That should save you some time in storing data. 

Do all your SaveChanges() take equal amount of time? 

You could add a timer inside the contexts to print out a console message with time to confirm how long a using statement takes to come to an end.

If you are relying on how long it takes to show in the view, i suggest using a tool like Glimpse or MiniProfiler to give you feedback on time spent rendering/servertime.