Bug 515886

Summary:	Short freeze of kwin when opening the Signal application
Product:	[Plasma] kwin	Reporter:	thesword <thesword53>
Component:	performance	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	REPORTED ---
Severity:	normal	Keywords:	wayland-only
Priority:	NOR
Version First Reported In:	6.5.5
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description thesword 2026-02-11 20:57:58 UTC

SUMMARY

When I open the Signal application, kwin (Wayland) lockups for 200-400ms.

STEPS TO REPRODUCE
1. Open the Signal application, while moving the cursor.

OBSERVED RESULT
Short freeze of 200-400ms.

EXPECTED RESULT
No freeze.

SOFTWARE/OS VERSIONS
Linux: 6.18.9-arch1-2
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.2

ADDITIONAL INFORMATION
The main thread seems to spend too much time here:
#0  0x00007f7a4408a934 in ?? () from /usr/lib/libKF6Notifications.so.6
#1  0x00007f7a40f6ab94 in QCoreApplicationPrivate::sendThroughApplicationEventFilters(QObject*, QEvent*) () from /usr/lib/libQt6Core.so.6
#2  0x00007f7a421033a4 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt6Widgets.so.6
#3  0x00007f7a40f6bf48 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt6Core.so.6
#4  0x00007f7a40f6c320 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt6Core.so.6
#5  0x00007f7a411300cd in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt6Core.so.6
#6  0x00007f7a41d33cf3 in QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt6Gui.so.6
#7  0x00007f7a40f76cf6 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt6Core.so.6
#8  0x00007f7a40f709f1 in QCoreApplication::exec() () from /usr/lib/libQt6Core.so.6
#9  0x000055afc7976a94 in ?? ()
#10 0x00007f7a40836635 in __libc_init_first () from /usr/lib/libc.so.6
#11 0x000055af30313050 in ?? ()
#12 0x00007ffcf64996a8 in ?? ()
#13 0x0000000e01086c10 in ?? ()
#14 0x000055afc79746a0 in ?? ()
#15 0x0000000000000000 in ?? ()