Why did moving the mouse cursor cause Windows 95 to run more quickly?
From a comment:
Try opening a large file with Notepad on a contemporary machine. The window must not be full screen. When loaded, mark all text using the mouse (the keyboard works as well, it just needs more manual skill). While still holding the button down (and marking) move the mouse down, so the text gets marked and scrolled. Now compare the scroll speed while holding the mouse still versus wiggling it. Depending on your machine the speed up can be several times faster.It's not just Notepad :-) I do this often, when I have to mark a lot of things.