Bug 501574 - Alt + Tab gets gradually slower over time
Summary: Alt + Tab gets gradually slower over time
Status: REPORTED
Alias: None
Product: kwin
Classification: Plasma
Component: tabbox (show other bugs)
Version: 6.3.3
Platform: Arch Linux Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-03-16 13:33 UTC by Alice
Modified: 2025-03-17 22:56 UTC (History)
1 user (show)

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


Attachments
JournalCTL logs from KWIN (853.21 KB, text/plain)
2025-03-16 13:33 UTC, Alice
Details
GPU information (1.13 KB, text/plain)
2025-03-16 13:38 UTC, Alice
Details
System Information (7.19 KB, text/plain)
2025-03-16 13:39 UTC, Alice
Details
Plasmashell logs (523.12 KB, text/plain)
2025-03-16 13:39 UTC, Alice
Details

Note You need to log in before you can comment on or make changes to this bug.
Description Alice 2025-03-16 13:33:10 UTC
Created attachment 179451 [details]
JournalCTL logs from KWIN

SUMMARY
ALT + TAB becomes slower over time, taking longer and longer to display the next window when pressing the combination.

STEPS TO REPRODUCE
1. Use KDE Plasma as normal for a few hours, alt tab frequently, I used Audacity, and I closed it quite a lot while transferring sound files one at a time from my local storage to my media server using the split view.

OBSERVED RESULT
You'll see a delay of 1-2 seconds when switching tabs that won't go away no matter how many windows or processes you close. Everything else should perform as expected.

EXPECTED RESULT
Alt + Tab not slowing down at all after several hours.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 6.3.3
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.2

ADDITIONAL INFORMATION
Comment 1 Alice 2025-03-16 13:37:39 UTC
Forgot to add, I'm using the 6.13.6-zen1-1-zen kernel (64-bit).
Comment 2 Alice 2025-03-16 13:38:42 UTC
Created attachment 179453 [details]
GPU information
Comment 3 Alice 2025-03-16 13:39:00 UTC
Created attachment 179454 [details]
System Information
Comment 4 Alice 2025-03-16 13:39:57 UTC
Created attachment 179455 [details]
Plasmashell logs
Comment 5 Alice 2025-03-17 22:56:22 UTC
So I've done some using of my computer for a few hours, and it's definitely the combination of what I was doing with Audacity, Dolphin and transferring files. The alt tab is still fine even after sleep mode which was another theory of mine I had. Hopefully replicating it will show some possible results on your end?