SUMMARY I've tested the Nightly build(git de8ea34), 4.2.8, 4.1.7, 3.3.3. Happens in all of those. As the Krita window gets bigger, - Choosing color in Advanced Color Selector(And other color selectors) becomes insanely slow. If I drag the cursor to another color inside the triangle or the square, I have to wait until the moving is finished, and it takes a long time. - Moving vector objects becomes slightly laggy. - Moving canvas view with Pan Tool becomes slightly laggy. There're the slowest in full-screen mode(Ctrl Shift F). And there could be other stuffs behave like this. * It happened in Linux Mint 19.3 Cinnamon too, and also in Windows but not as badly as it is in Linux. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Kubuntu 18.04 (available in About System) KDE Plasma Version: 5.12.9 KDE Frameworks Version: 5.44.0 Qt Version: 5.9.5 ADDITIONAL INFORMATION
* I'm not sure those(Color Selector, Vector Objects, Pan tool, etc) have the same culprits. (I'm not a coder!) Maybe each of them have their own separated issues. * Actually the difference is almost unnoticeable in Windows(7).
* I've noticed the slowdown in choosing color also happens (slightly) in firealphaca(which also uses QT)...
I've never seen things become insanely slow myself; but in general, the more pixels that need to be moved, the more work the pc has to do, and the more time that takes. And it's even stranger that things get slow for you when you use Krita full-screen, since that disables window manager compositing, which makes Krita faster when using GPU accelaration for the canvas. Is this all on the same PC, regardless of OS?
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Since I've decided to use Windows a bit longer instead of Linux I won't be able to test or explore this bug probably until the next year.
Okay, then I guess we can change the status of the bug as well to later.