Created attachment 108891 [details] Lag on the start of each stroke in a group I noticed this lag happens once and doesn't happen for succeeding strokes until I focus out or do any type of keyboard shortcut commands. This is especially noticeable with very fast strokes. Tablet: HUION H610 PRO @ version 12.3 drivers (latest from huiontablet.com) with "Support TabletPC" enabled (not like it does anything with or without it.) I'm using the default WinTab input and OpenGL canvas. You'll see in the attachment, the first stroke in each row has a straight line near the first. Even without smoothing the lag on the initial stroke is visibly longer than the rest of the segmented stroke. I tested on Photoshop and it doesn't have this problem. Another thing I noticed while drawing any stroke: the cursor freezes just after I finish it with or without smoothing.
correction: "the first stroke in each row has a straight line near the beginning of the stroke"
Can you make a tablet log showing the issue? https://docs.krita.org/KritaFAQ#What_if_your_tablet_is_not_recognized_by_Krita.3F
Created attachment 108964 [details] Opened Krita, drew several lines with couple of undoes. Here ya go. Opened Krita, drew several lines with couple of undoes. Strokes after each undo were jagged in the start of the stroke.
Fixed. Seems to be a HUION issue as it appears on other programs (Photoshop just hides it better) Solution was unchecking `Support TabletPC` in the HUION Driver settings.