https://bugs.kde.org/show_bug.cgi?id=433907
Bug ID: 433907
Summary: plasmashell works slow when displaying textual list of
grouped tasks for big group
Product: frameworks-plasma
Version: 5.79.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: libplasmaquick
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
SUMMARY
When a lot of windows is grouped, and textual list of grouped tasks is
displayed, plasmashell may work slowly.
STEPS TO REPRODUCE
1. open task manager settings, in "Behaviour" group set "Group:" to "By program
name", set "Clicking grouped task:" to "shows textual list".
2. Open 50-100 instances of application. I used 100 instances of "konsole" for
that purpose.
3. Ensure there is enough RAM, so swapping and OOM killer wouldn't interfere.
4. If some windows were not moved into same group upon creation in task
manager, click on them. When window goes foreground, it's moved into main group
on taskbar. I assume it's a separate issue.
4. Click using LMB on grouped window on taskbar.
OBSERVED RESULT
It takes up to a few seconds to show textual list of grouped tasks. And after
showing this list, it takes a few more seconds for mouse scrolling or other
interactions to start working.
EXPECTED RESULT
Immediate response: immediate appearence of textual list, immediate response to
mouse actions, like there were only 2
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: ALT Linux Sisyphus
(available in About System)
KDE Plasma Version: 5.20.5
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
I've tried reproducing it on fresh Neon, issue appears there as well. Sometimes
it works slower, sometimes it works faster, but if you add more windows and
ensure there is enough RAM, issue is still reproducible.
$ sha256sum neon-user-20210225-0945.iso
e914077a3bb85903c03d792fb0e04da466bedfde130e0f6d54f76ebfaaa38bd7
neon-user-20210225-0945.iso
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