System Information
Operating system: Windows 64 bits
Graphics card: GTX 1080 ti

Blender Version
Broken:
2.79 and 2.8

When painting in texture paint I´m having lag that gives me straight lines instead soft curves.
This is happening to me and a friend, and both have a 1080 ti.
I tested the same problem in a pc with a Geforce 820m and in other pc with a RTX 2080 and worked perfectly, so appareantly the problem is only with the 1080 ti **

-Select the default cube and select the texture paint workspace
-Create a new Image and select this image in the texture slots (single image mode)
-With the brush draw some curves in the cube and you will notice **