First the human angle.
When we have "alot on our plate" we get stressed. To much stress can cause breakdown or depression. When depressed we are paralyzed. Can't process anymore.
The simulation/processor angle.
When your computer has to many programs to open on startop, it feels like eternity before it's finally ready. Adding more programs and processes to this, will make it slow in performance. If you keep adding work to it, it will eventually stall so much, that you can't use it for several minutes. Sometimes it even freezes.
Depression is a freeze. Stress is very slow processing.
It makes sense.
But we can't restart, like a device. We need to shut down processes ourselves, or with help from professionals. We only got this session.
So the next time you feel stressed. Halt! Don't allow it! Let your processor rule the speed of events. Say no! Disconnect. Take control of your life!