The specifications dissected
If you take a look at the specifications of a mouse, you will come across some terms that you might not recognize immediately. Manufacturers use different names to present the maximum speed that a mouse can register. One might speak of 300 inch per second, another states 7000 frames per second and a third brand shows the 'processing rate' in megapixels per second. As with for example case fans and their noise levels, every manufacturer measures in a different way and more often than not the values are exaggerated. You can leave these specifications for what they are.
The aspect that mouse marketeers are unanimous about is dpi, or the resolution of the sensor shown in pixels per inch. The dpi-value is basically the amount of pixels that the cursor moves on your screen with the movement of one inch, and shows the sensitivity of the cursor. If you use a monitor with high resolution (something that is more common even with gaming monitors), you probably want to work at a slightly higher dpi, because you have to travel more digital distances with your mouse. There is definitely a race for the highest value, but higher is not necessarily better. Especially with cheaper mice inter- or extrapolation is often used, which results in a decrease of accuracy.
Since the introduction of gaming mice the discussion about the ideal dpi-setting exists. This virtually does not exist, if only because of the mentioned cohesion with the monitor resolution. We distinguish between low-sense, mid-sense and high-sense: a low, average or high sensitivity. A low-sense gamer uses a relatively low dpi (usually 800 or lower) and often lifts their mouse in order to move further, while a high-sense gamer makes small movements thanks to the high dpi (more than 1200 dpi).
Another specification that you often see is the so-called polling rate, the frequency at which the mouse sends information to the computer. The maximum is often 1000 Hz, or a thousand times per second. Regular mice usually operate at 125 Hz. In the worst case this introduces a lag of 8 ms.