Not yet. Soon I will add an ability to have different contexts and a way to switch between them, so you could have a very simple one waiting for some event to switch to the real one. That's pretty high on the to-do list, it'll probably be added within a month.

I don't know if scaling the cpu speed would make sense based on how the final program is compiled, but I'll look more into that. To save power now the only thing you can do is use as low a refresh rate as you can get away with. Also note that most nodes only execute when their inputs change, so the processor time estimates are a worst case scenario if all nodes in the project were fully updating on every update.