Little fps in the program, slow brush cursor

[Duse Channel]

My problem is that the brush cursor is much slower than the mouse cursor. I mean: when I draw and quickly draw a brush, the line is drawn very smoothly. The same is with the program interface: it feels like the fps is limited to 30. In other programs, this problem is not. It’s annoying and I don’t know how to solve it. Are there people who have encountered this?

There is a video with the problem