Bug 400899

Summary: Kwin and plasmashell performance issues with i965
Product: [Plasma] plasmashell Reporter: undying.k
Component: generalAssignee: David Edmundson <kde>
Status: RESOLVED DUPLICATE    
Severity: major CC: plasma-bugs
Priority: NOR    
Version: 5.14.2   
Target Milestone: 1.0   
Platform: Gentoo Packages   
OS: Linux   
Latest Commit: Version Fixed In:
Attachments: kwin perf svg
plasmashell perf svg

Description undying.k 2018-11-10 09:02:59 UTC
Created attachment 116224 [details]
kwin perf svg

SUMMARY
Kwin version: 5.14.3

After update and fresh system reboot I've noticed that rendering performance is degraded.
Using top I found that kwin and plasma shell permanently uses 10-15% of CPU.

STEPS TO REPRODUCE
1. update to 5.14.3
2. reboot system
3. open shell to see top

OBSERVED RESULT
bad rendering performance and high cpu usage

EXPECTED RESULT
good rendering performance without lags

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 4.19.0-gentoo
(available in About System)
KDE Plasma Version: 5.14.3
KDE Frameworks Version: 5.51.0
Qt Version: 5.11.2-r1

ADDITIONAL INFORMATION

In attachments I'll provide perf.svg for kwin and plasmashell.
Comment 1 undying.k 2018-11-10 09:03:30 UTC
Created attachment 116225 [details]
plasmashell perf svg
Comment 2 Martin Flöser 2018-11-10 09:15:06 UTC
reassigning to plasmashell, KWin is probably only affected as plasma triggers repaints.
Comment 3 undying.k 2018-11-10 21:56:53 UTC
Found interesting correlation:
https://yadi.sk/i/7g4UwscZwOF4xA

It seems that there is one more bug.
Comment 4 David Edmundson 2018-11-10 22:06:13 UTC

*** This bug has been marked as a duplicate of bug 384532 ***