Bug 443696

Summary: notices with expire times consume a lot of cpu and make the desktop unresponsive
Product: [Plasma] plasmashell Reporter: Michael Hamilton <michael>
Component: NotificationsAssignee: Kai Uwe Broulik <kde>
Status: RESOLVED DUPLICATE    
Severity: normal CC: nate, plasma-bugs-null
Priority: NOR    
Version First Reported In: 5.22.5   
Target Milestone: 1.0   
Platform: openSUSE   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Michael Hamilton 2021-10-14 07:02:22 UTC 
Plasmashell and kwin_x11 consume a lot of CPU if multiple expiring notices are visible at the same time.

STEPS TO REPRODUCE
1. In a konsole bash shell execute many 20-second notifications:

  for i in 1 2 3 4 5 6 7 8 9 10; do notify-send --expire-time 20000 test $i;done

OBSERVED RESULT
Unresponsive/jerky desktop. High CPU usage.  Window dragging is very jerky.  Performance returns to normal as notices expire.

EXPECTED RESULT
No substantial effect on desktop responsiveness or CPU consumption.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: OpenSUSE Tumbleweed 20211005
(available in About System)
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.15.2
Qt Version: 5.15.2

ADDITIONAL INFORMATION
Processors: 6 x AMD-6300
Memory: 15.5 GiB
Graphics Processor: NVIDIA GeForce GTX 1650 SUPER with proprietary driver.
Comment 1 Nate Graham 2021-10-14 23:24:05 UTC 

*** This bug has been marked as a duplicate of bug 414785 ***