Comment by jacquesm

That's because our operating systems treat user input as a soft real time problem when actually it should be a hard real time problem. That's why your window manager sometimes can be unresponsive. I've used a hard real time OS for a desktop for some years and the difference with consumer stuff was extreme. You get used to the computer instantly doing what you tell it to do. None of these half second or longer delays between command and result. It's like magic.