Add items in a source

[sterien7]

I am developing an app which renders locations on map. So whenever I get a response from the backend I need to add an item in the source. The only way that I found to do that is to recreate the source each time. This approach is not performing well and in my case I need to add 20 items per second so I have to recreate the whole set 20 times per second rather than adding a single item in the already created list. Is there an other way?