https://bugs.kde.org/show_bug.cgi?id=461338
Bug ID: 461338
Summary: Kwin hangs when pressing Alt+Tab
Classification: Plasma
Product: kwin
Version: 5.26.2
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: puspitaadak9...@gmail.com
Target Milestone: ---
Kwin hangs when pressing Alt+Tab for the 1st time. In the subsequent times
also, kwin hangs if there are a lot of windows open and the Alt+Tab module is
taking time to render.
STEPS TO REPRODUCE
1. Restart your computer or drop caches in Linux.
2. Start an application such as Chrome, which does a lot of disk I/O.
3. Press Alt+Tab and see the whole screen just hangs. You will be unable to
click on any other application or any panel item.
OBSERVED RESULT
Kwin hangs for some time after pressing Alt+Tab, maybe because it takes some
time to load the Alt+Tab module. It renders the whole desktop useless during
that time.
This is mostly noticeable on systems with rotational hard disk due to its read
latency.
EXPECTED RESULT
Kwin shouldn't hang.
SOFTWARE/OS VERSIONS
Linux: 5.15.76-1
(available in About System)
KDE Plasma Version: 5.26.2-1
KDE Frameworks Version: 5.99.0-1
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