Mouse lags when CPU loads

If this is a wireless mouse, before going down this rabbit hole of debugging, make sure the USB port you have connected the mouse to is not a USB 3.0 port (the port has a blue inner color), but a 2.0 (the inner color is white or black). If you have no USB 2.0 ports on your machine, make sure to at least not to have anything plugged in into an adjacent USB 3.0 port to the one the mouse is plugged in to. I have bought a cheap USB 2.0 hub just to solve this problem (one can be had for about $3).

You can find here a detailed explanation of the problem. https://www.bluetoothandusb3.com/the-explanation

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