Thank you for your answer. I have done that, but it's more of a workaround and does not really offer the fluidity needed, I wish it was something like photoshop, where you can quickly and finely rotate the canvas when painting just hitting R key and dragging with the mouse, you hit escape key and the rotation goes back to normal, but I know it's not photoshop, so, hope they add a similar function in the near future. About the quality, it is just a thing with the software as I see, I get this kind of bad quality visualization (image I took from someone on this thread) no matter the zoom: