How to Turn off Mouse Acceleration in OS X
Mouse acceleration can be incredibly annoying to some users, especially if they recently switched from a Windows-based PC to the Mac. What it does is accelerate your mouse movements if you move your mouse faster across the surface. This is a quick way to get from one side of the screen to the other with minimal actual movement involved. This can be a big downside if you’re a frequent gamer or your work requires precision mouse movements. Thankfully, there are a few ways to get around mouse acceleration and make your mouse move more like it does on Windows.
Permanent Fix Through Terminal By entering the command below into terminal, you can kill mouse acceleration entirely. If you use a mouse that has adjustable sensitivity levels, this functionality may present itself more obviously after this adjustment is done. Here is how you do it:
Open Terminal from the (Application > Utilities) menu.
Enter the following code:
defaults write .GlobalPreferences com.apple.mouse.scaling -1
Close Terminal and reset the computer.
You can disable this adjustment at any time by repeating the steps and replacing the -1 with a 1.
Official Third-Party Mouse Drivers Several manufacturers of high-end gaming mice have started to make officially supported drivers for their products that allow you to directly or indirectly influence the amount of acceleration applied to your mouse cursor movements. It would be a good first step (if you use a third-party mouse) to take a look at the manufacturer’s official support site and see if there are any Mac support drivers available and give them a try.