Well. Windows Ink is a half-solution. Switching to Windows Ink get other lags (discussed it here Dizziness from Rotating Triangle of pop-up Palette) and involves not only Krita but other painting software too.
The current “First stump” issue is only Krita “feature”.
I tested it with the same result on various systems:
Ryzen 1600 + GTX960
Athlon 200GE + internal GPU
I3 6100 + internal GPU
i3 4030 + internal GPU
Windows 7, 8, 10
Intuos5, Cintiq 13hd
And I wonder, if it I so lucky or nobody use undocked docks in Windows + Wacom? I just think to make a bug report but want to be sure that I’am not alone.
Could anybody who use Windows + Intuos or Cintiq make a test and post a result here?