A mouse speed between 20-25 is a good starting point, along with a DPI of 1600. What this mouse speed will do is allow you to adjust to the speed of play without making precision errors. It will also give you time to adjust to the high DPI. The lesser the mouse speed, the more control to begin with. It helps safe play.
This is a technique used by mid-high elo players for a variety of reasons. Doing it usually just requires fast klicking and mouse movements around your champion but you also have to know what you are doing and why you are doing it. So about how they do it: They simply move their mouse back and forth in a straight line while clicking on the end.
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