Razer

Acceleration is the rate of change of velocity of the mouse, or how quickly it accelerates from one point to another. Each mouse has a specific acceleration rating, which is its limitation on speed of movement that its sensor can effectively detect. If the mouse is moved at a rate faster than its acceleration rating, the sensor would not be able to keep up and the cursor movement on the screen would not correspond to the mouse movement by the user.

Acceleration is measured in a unit of "g" (acceleration of gravity), where one g is equivalent to a rate of change of 9.8 m/s-2 (meters per second each second). Exceeding a sensor's g rating may cause the sensor to lose track of mouse movement.

A high Acceleration rating will ensure that your cursor never moves erratically in-game at crucial times when you need to make a quick swipe to turn and focus on a new target.

Acceleration is largely dependent on your playstyle and whether or not you are a low sensitivity gamer. If you are a low sensitivity gamer, you will often make very fast and large swipes across a mousing surface in order to quickly reorient yourself to a new target in-game. If a mouse’s acceleration rating cannot handle how quickly your hand moves the mouse each second, at any part of that second, the sensor will fail and the cursor will move around erratically.