https://bugs.kde.org/show_bug.cgi?id=503696
Bug ID: 503696
Summary: Krita Next nightlies have significant lag during
undo/redo/canvas input when editing large files
Classification: Applications
Product: krita
Version: nightly build (please specify the git hash!)
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: * Unknown
Assignee: krita-bugs-n...@kde.org
Reporter: tysont...@gmail.com
Target Milestone: ---
In recent Krita Next nightly builds, I experienced significant lag when editing
large files, especially during undo/redo actions or canvas input with modifiers
like Ctrl/Shift. It takes 1 to 3 seconds for the software to respond to any new
action different from my previous one.
For example, when I keep drawing brush strokes, everything works fine. However,
as soon as I press any other key, Krita becomes unresponsive for a few seconds.
If I undo and then redo actions, Krita freezes momentarily before responding.
During this time, input is often lost, requiring me to press the shortcut
multiple times for it to register.
I guess there's a regression in either the Undo/Redo or the Canvas input
system.
Does not affect Krita 5.2.9.
Tested with krita-5.3.0-prealpha-7d6986ff4a-x86_64.AppImage
You can test this bug with this file:
https://tysontan.com/temp/spirited_20230228A_leiting_keyart_plus.zip
When I confirmed the bug, I hid all layers except one girl and used the red
layer to detect transparency.
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