I'm not sure if this is the game or just my browser, but when an action gets sufficiently cheap in flux my loop starts to slow down. Specifically, I currently have Do Makeup taking slightly under 2 flux per action and the scrub completes about 10 times per second. It was previously (in the same loop) completing about 20 times/second while taking slightly over 2 flux per action. It might be useful to have a built-in "spend ×10 flux for ×10 rewards" option on actions which can be repeated like this? I don't actually know whether that would help but it might.