Massive Lag while painting

[inc]

thanks for reply. i tried artrage in window mode at: 2560x1560

same delay here. i give a try in windows 10 x64 (will give feedback later) but something goes wrong here with windows 7.


edit:

same in Windows 10 Pro x64

very strange because i have absolut no Problem with the same Settings in my other paint program: PhotoPaint by CorelDraw