Somehow, when you set the Pivot Point to the 3D Cursor, the Mouse Pointer appears to be ‘connected’ to the 3D Cursor. (When you try to Scale, there is a ‘line’ between the two…)
Imagine a Plane, parallel to your screen and going through the 3D Cursor. This is the plane that your Mouse Pointer moves along.
If you have your 3D Cursor ‘in front’ of the Default Cube, then your Mouse appears to move faster than the Cube (or any Object) and if the 3D Cursor is ‘behind’ the Cube, then the Cube appears to move faster. (Parallax effect..)
