Bug 443748

Summary: Filter previews gets slow when the zoom level is above 50%
Product: [Applications] krita Reporter: acc4commissions
Component: FiltersAssignee: Krita Bugs <krita-bugs-null>
Status: RESOLVED INTENTIONAL    
Severity: normal CC: dimula73
Priority: NOR    
Version First Reported In: git master (please specify the git hash!)   
Target Milestone: ---   
Platform: Compiled Sources   
OS: All   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description acc4commissions 2021-10-14 22:53:41 UTC 
SUMMARY
git d65c3f4

STEPS TO REPRODUCE
1. Draw something.
2. Set zoom level to over 50%(e.g: 67%) > HSV adjustment filter > play with parameters.
3. Set zoom level to under 50%(e.g: 33%) > HSV adjustment filter > play with parameters.

OBSERVED RESULT
Krita shows slower preview on the case 2, in comparison to the case 3.

EXPECTED RESULT
There should be no difference. (or, it should be even faster when the canvas is zoomed in, in my personal opinion).

SOFTWARE/OS VERSIONS
Windows: Win7
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
Comment 1 acc4commissions 2021-10-14 22:54:10 UTC 
Edit : the os is Win10, not Win7.
Comment 2 acc4commissions 2021-10-14 22:57:02 UTC 
It's much easily observable when the layer size is big.
Comment 3 acc4commissions 2021-10-14 23:34:41 UTC 
Is this due to instant preview stuff? Checking that option in menu > view seems irrevelant on this.
Comment 4 Dmitry Kazakov 2021-10-15 05:47:12 UTC 
Hi, acc4commissions!

That is expected behavior and it is related to the settings in Preferences->Performance->Instant Preview. When you apply filters on zoom levels below 50%, Instant Preview is used. Since recently, Instant Preview will also be activated even when you have it disabled in View->Instant Preview. This behavior can be disabled in Preferences->Performance->Instant Preview