https://bugs.kde.org/show_bug.cgi?id=455570

--- Comment #23 from Protoniv <ss93...@gmail.com> ---
Hi @Dmitry,
Sorry for my interruption.
I'd like to feedback the performance regression (from my test) after July 1st
build on linux (OpenSUSE Leap 15.4).
===============
GPU: Nvidia GT540M ; Intel iGPU (different machine)
test package: 
krita-5.1.0-beta1.appimage
krita-5.1.0-beta2-bd5563bad0.appimage (July 1st)
================
Test brush 1 : b)Basic-2 Opacity -> switch to "moo bubble" brushtip, 500px
Test brush 2 : b)Basic-2 Opacity -> density 25~30%, 500px, Canvas 200%(to get
the fuzzy outline)

5.1.0-beta1 : Brush outline "drawing performance" and "hover performance" are
quite similar
beta2-bd5563bad0 : Brush outline "drawing performance" is now much slower than
"hover performance"

The "hover performance" in these two build are very similar, but "drawing
performance" has regression on July 1st build.

#########################

(In reply to Dmitry Kazakov from comment #22)
> PS:
> The fact that FPS drops a bit when you start painting is kind of expected
> with the current design of the canvas. The point is that the outline is
> painted alongside the canvas image itself. And when start painting more data
> on the canvas (the image), then FPS also drops.

About brush outline stuck when start drawing on Windows (Not on linux),
the outline actually stuck several seconds if not release the stylus, in every
stroke on my machine (intel iGPU), can be seen in the video in this thread.
https://krita-artists.org/t/krita-5-1-0-beta-2-the-intolerable-cursor-stutters-continues-despite-a-fix/43484/5
I haven't test on pc with Nvidia dGPU yet.

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