https://bugs.kde.org/show_bug.cgi?id=515571
Bug ID: 515571
Summary: Sluggish response time with mixed refresh rates
Classification: Applications
Product: krita
Version First 6.0.0-beta1
Reported In:
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: * Unknown
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 189252
--> https://bugs.kde.org/attachment.cgi?id=189252&action=edit
latency comparison video
SUMMARY
Krita 6 has a significantly higher latency by default for me compared to Krita
5.
My primary monitor is 144Hz, my others are 60Hz. When krita is on a 60hz
monitor it's very sluggish, but on the 144Hz monitor it's fine.
Using the vblank_mode=0 env variable alleviates the lagginess on the 60hz
monitors.
Changing my primary monitor's refresh rate down to 60hz also seems to fix it
instantly, even while Krita is running. (see attachment for a video taken on my
60hz monitor, showing the panning latency before and after adjusting the other
monitor's refresh rate)
Happens both with and without Canvas Graphics Acceleration checked.
STEPS TO REPRODUCE
1. Have too multiple monitors with different refresh rates
2. Run krita 6.0 on one of the lower hz ones
3. I assume wayland is also important?
OBSERVED RESULT
program repainting seems very slow and lags far behind
EXPECTED RESULT
no laggier than krita 5 in the same scenario
SOFTWARE/OS VERSIONS
$ kinfo
Operating System: Kubuntu 25.10
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2
Kernel Version: 6.17.0-8-generic (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-6700 CPU @ 3.40GHz
Memory: 32 GiB of RAM (31.3 GiB usable)
Graphics Processor: AMD Radeon RX 6600
ADDITIONAL INFORMATION
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