If you use both the mouse and your laptop’s touchpad in tandem you must have realized that a universal sensitivity for both doesn’t work well. This is where you need application like AutoSensitivity.
AutoSensitivity allows you to define different mouse sensitivities for your touchpad and mouse and automatically switch between them when you connect and disconnect the mouse. You simply define two different speeds and the utility automatically switches between them when you plug or unplug the mouse. This saves you from manually changing the speed every time you plug in a mouse.