Change mouse or trackpad tracking, double-click, and scrolling speed on Mac
To work more comfortably, change the way the pointer responds as you move the mouse or use the trackpad.
Note: To change mouse or trackpad settings, you must have a wireless mouse or trackpad connected to your Mac, or be using a Mac with a built-in trackpad.
Change tracking speed
Adjust how quickly the pointer moves when you drag the mouse or your finger on the trackpad.
On your Mac, choose Apple menu
or Trackpad 
in the sidebar. (You may need to scroll down.)Drag the “Tracking speed” slider on the right.
Tip: As you adjust the slider, try moving the pointer to see the effect of your changes.
By default, the pointer moves more quickly for fast mouse movements and more precisely for slow mouse movements. To turn this option off in Mouse settings, click Advanced, then turn “Pointer acceleration” off.
Change double-click and scroll speed
On your Mac, choose Apple menu
in the sidebar. (You may need to scroll down.)Click Pointer Control on the right, then do any of the following:
Adjust how fast you must click for your Mac to recognize a double-click: Drag the slider next to “Double-click speed.”
Adjust how quickly content moves when you scroll: Click Mouse Options or Trackpad Options, then drag the slider next to “Scroll speed.”
To change how you secondary click (or Control-click), see Right-click on Mac.
If you have trouble using a mouse or trackpad, you can turn on Mouse Keys, then use the keyboard or a numeric keypad to move the pointer and click. See Control the pointer using Mouse Keys.