Adjust speed of the mouse and touchpad
If your pointer moves too fast or slow when you move your mouse or use your touchpad, you can adjust the pointer sensitivity and acceleration for these devices.
Click the icon at the very right of the menu bar and select System Settings.
Click Mouse and Touchpad.
Under Pointer Speed, adjust the Acceleration and Sensitivity sliders until the pointer motion is comfortable for you.
Sensitivity is how much your pointer initially moves when you move your mouse.
The farther you move your mouse, the faster and faster the pointer moves relative to your movement. This helps you get the pointer across the screen without lifting your hand, while still letting you point and click accurately. Acceleration controls this behavior.
You can set the sensitivity and acceleration differently for your mouse and touchpad. Sometimes the most comfortable settings for one type of device aren't the most comfortable for another. Just set the sliders on both the Mouse and Touchpad tabs.