Hi there!
Decker is definitely intended as a drawing program! And it usually works fine with tablets. I draw all my art directly in Decker with a tablet for my projects here on itch. (And I have an old speedpaint of doing exactly that, made while recording my display tablet)
So the problem isn't inherent to the program... and I really hope we can find a fix for you and your tablet.
If you don't mind, as a starting point... Your image didn't load for me so I gotta this ask for clarification:
Are you experiencing line delay while using Wigglypaint in the Decker application (wigglypaint tools, drawing on the wigglypaint drawing area)?
Or are you experiencing this while using the general Decker drawing tools (selecting the drawing tool from Decker's menu or toolbars and using it to draw directly on a card)?
(Or both?)
And also what operating system are you using?
(There will probably be follow-up questions from me or others but this is helpful info for people to start with)
