Change your mouse tracking speed in Mac OS X

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If the available settings in the mouse preference panel aren’t good enough for you, You can adjust the tracking speed via OS X Terminal using the following command: 

defaults write -g com.apple.mouse.scaling x.x

Replace x.x with a number between 1 and 5:

defaults write -g com.apple.mouse.scaling 4.5

Use for fast tracking 5.0, and for slow tracking 1.0

Restart your Mac for changes to take effect.

Restore to default setting with:

defaults delete -g com.apple.mouse.scaling

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