What will happen if everything speeds up at the same rate? I mean everything from the oscillation of the electron to the galaxy rotation. Including speed of every event and process. Who would notice such a change in speed? And what if everything slooooows down? What if the speed is continuously changing? How can we know from within a closed system?

What if there is some kind of a dial outside the system (universe) where it can be used to control such a speed? How fast it can go and how slow? What if the controller turns the knob such that the 13.6 billion years to us is one second to him? So is life too short really?