Introduction
This isn’t quite as easy as it should be. Microsoft has done a half-job in moving all the legacy settings into their new control panel.
Step 1
Next to the Windows button in the lower left hand corner there is a magnifying glass and a white area you can type. Click on that white box and type in “mouse speed”. Now choose “Change the mouse pointer display or speed”.

Step 2
Now you can click on the mouse speed that you want on the scale from “Slow” to “Fast” and then hit “OK” at the bottom.