Thanks.
Still too slow? Can you give me more info please, cause I have only my PC with Ubuntu to test this.
For example what is your resolution?
The OS you are using.
Is the speed of your mouse pointer slow, fast....
Edit: I ask all this cause Godot even in 3.1 contains a problematic mouse motion input. For example speed is wrong and I had to use relative position. I have created a github issue that is almost 2 years old but there is no fix for this. I will try to use the screen resolution for the mouse sensitivity. This will probably solve the problem.