Your mouse's polling rate determines how often it sends data to your operating system. All mouse movements (counts) and button presses must wait in the mouse until windows polls for them. By default, windows will poll a usb mouse every 8 milliseconds (125hz).
You can increase the frequency of polling with a number of programs/drivers/registry fixes. All this does is reduce the delay of sending the mouse data to the operating system. This has no effect on your sensitivity, but it will increase cpu usage.
For example, say you a
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