Improve Loading Speed of the Graphs

[VladimirAkopyan]

At the moment graphs take a long time to load on crappy computers, like my laptop. It's going to become more of a problem as we accumulate more data. You should add a spinning circle for hte duration of load operation, and see if you can improve loading speed. In our previous app i have tested a few ways of doing that, see here: http://stackoverflow.com/questions/35854862/how-to-read-a-thousand-objects-with-ef7-and-sqlite