Reduce supervision tree loading time

[baransu]

It's very annoying when switching back and forth between tabes you have to wait few seconds to get tree view. We definitely should improve that.

[arkgil]

Couldn't we cache the data and not remove the trees when we switch tabs? But this thinking might be related to my lack of frontend knowledge.

[baransu]

I'm thinking about something like this. It all depends on VivaGraph API and how complex workaround I have to do.