VladimirAkopyan
commented
8 years ago I have done some tests and tracked down the problem. Database loads reasonably fast - on the order of 400ms. All the CPU consumption is caused by the line:
ChartSeries.ItemsSource = historicalDatapoints;
This sets the data for each chart series on the graph, and is called for every sensor. Every time that's done, it takes 300ms on my desktop. Perhaps we could avoid this cost if we could set up all the series without triggering UI update every time. Alternatively we could just show a loading bar.
Also check line 129, for the way we wired the Realtime switch.
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