Bug 477357 - Choppy scrolling in Plasma Search KCM
Summary: Choppy scrolling in Plasma Search KCM
Status: CONFIRMED
Alias: None
Product: systemsettings
Classification: Applications
Component: kcm_plasmasearch (show other bugs)
Version: 5.27.80
Platform: Neon Linux
: NOR minor
Target Milestone: ---
Assignee: Plasma Bugs List
URL:
Keywords: efficiency-and-performance, qt6
Depends on:
Blocks:
 
Reported: 2023-11-22 10:09 UTC by Patrick Silva
Modified: 2024-01-20 17:41 UTC (History)
6 users (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
Profile (1.19 MB, image/png)
2023-11-22 19:00 UTC, Nicolas Fella 		Details
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Description Patrick Silva 2023-11-22 10:09:46 UTC 
STEPS TO REPRODUCE
1. open Plasma Search KCM
2. scroll though the plugins list - I use a touchpad
3. 

OBSERVED RESULT
choppy scrolling

EXPECTED RESULT
smooth scrolling

SOFTWARE/OS VERSIONS
Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.81.80
KDE Frameworks Version: 5.245.0
Qt Version: 6.6.0
Graphics Platform: Wayland
Comment 1 Bharadwaj Raju 2023-11-22 12:35:25 UTC 
`reuseItems: true` greatly improves the performance after the first scroll.

But I want to profile it and find out why it's taking so long in the first place.
Comment 2 Nicolas Fella 2023-11-22 19:00:29 UTC 
Created attachment 163372 [details]
Profile

Profiling suggests there's unusually much time spent in PlasmaDesktopTheme::syncColors() (qqc2-desktop-style)

Interestingly e.g. the kded KCM doesn't seem to be affected
Comment 3 Nate Graham 2023-11-27 02:12:48 UTC 
Can also reproduce. +1 for setting reuseItems here, in addition to anything else we do to lighten up these delegates or make deeper fixes.
Comment 4 Nicolas Fella 2024-01-08 23:48:03 UTC 
The difference to other KCMs seems to be that PluginDelegate uses Kirigami.ActionToolBar