https://bugs.kde.org/show_bug.cgi?id=520143
Bug ID: 520143
Summary: Canvas is jerky/stutters for about 1-2 minutes when
creating a new document
Classification: Applications
Product: krita
Version First unspecified
Reported In:
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: * Unknown
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 192269
--> https://bugs.kde.org/attachment.cgi?id=192269&action=edit
Screencast of the canvas lagging, then suddenly going smooth
DESCRIPTION
Krita seems to lag/stutter for approximately 1-2 minutes after creating a new
canvas. While any lines drawn appear to eventually get painted on the canvas
properly, pretty much anything that's moving (the cursor itself, the line being
drawn- even panning the canvas) is extremely laggy until suddenly everything
clears up and starts working again as expected.
Drawing/clearing the canvas doesn't seem to change anything, for whatever
reason it seems to be a time-based event that triggers the canvas to suddenly
start updating smoothly as expected. I can sketch a few lines, grab the canvas
with the button on my pen, and just sit there panning around and watching the
canvas move with an extreme amount of jerkiness until eventually something
changes and everything goes smooth again.
Issue seems to affect the canvas in both CPU and OpenGL modes, so I don't think
it's a graphics driver problem.
Currently running 6.0.2_pre20260509 on Gentoo Linux as there are no other
ebuilds that support QT6 at the moment (Gentoo recently dropped QT5 support
entirely).
I have attached a webm capture of this phenomena. The canvas goes "smooth"
right around 26.5 seconds into the video.
STEPS TO REPRODUCE
1. Open Krita
2. Create a new canvas
3. Attempt to draw, pan around a bit, etc- everything will appear laggy and/or
jerky
OBSERVED RESULT
Canvas is not smooth at all. It seems like Krita is receiving input events
properly since things eventually get drawn onto the canvas as expected, but the
act of trying to do so is extremely stuttery and not smooth at all.
EXPECTED RESULT
Drawing/panning should be buttery smooth (as it usually is).
SOFTWARE/OS VERSIONS
Operating System (available in the Info Center app, or by running `kinfo` in a
terminal window):
KDE Plasma Version: 6.6.4
KDE Frameworks Version: 6.25.0
Qt Version: 6.10.3
ADDITIONAL INFORMATION
Tablet is a Wacom Cintiq 16, but it seems like the same issue affects mouse
based input as well. Issue is present regardless of the canvas mode (CPU,
OpenGL, OpenGL ES, etc, etc).
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