Bug 446690

Summary: Window lag when using Breeze Dark + Oxygen
Product: [Plasma] Oxygen Reporter: Xterion <xterion>
Component: win decoAssignee: Unassigned bugs <unassigned-bugs-null>
Status: REPORTED ---    
Severity: normal    
Priority: NOR    
Version First Reported In: 5.23.3   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Xterion 2021-12-08 17:00:50 UTC 
SUMMARY
***
There is an annoying window lag when using Oxygen window decoration along with Breeze Dark theme. There is no lag when another window decoration is chosen. The animation speed is set to the default value, in the middle.
***

STEPS TO REPRODUCE
1. Set theme to Breeze Dark
2. Set application style to Breeze
3. Set Plasma style to Breeze
4. Set window decoration to Oxygen.

OBSERVED RESULT
Huge lag when minimizing and maximizing windows.

EXPECTED RESULT
Smooth minimization and maximization of windows.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.23.3
KDE Frameworks Version: 5.88.0
Qt Version: 5.15.2
Kernel Version: 5.10.82-1-lts (64-bit)
Graphics Platform: X11

ADDITIONAL INFORMATION
It can be observed on 2 different laptops with integrated GPUs:

[1]
Processors: 8 × Intel® Core™ i5-10310U CPU @ 1.70GHz
Memory: 7.5 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics

[2]
Processors: 8 × Intel® Core™ i7-10610U CPU @ 1.80GHz
Memory: 15.5 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics