Bug 449373

Summary: Slow wallpaper thumbnail loading
Product: [Plasma] plasmashell Reporter: Vytautas <doggoofspeed>
Component: Activity Switcher sidebarAssignee: Plasma Bugs List <plasma-bugs-null>
Status: CONFIRMED ---    
Severity: normal CC: ericedlund2017, ivan.cukic, nate, plasma-bugs-null
Priority: NOR    
Version First Reported In: 5.23.5   
Target Milestone: 1.0   
Platform: Other   
OS: Other   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: The slow loading in action

Description Vytautas 2022-01-30 15:49:27 UTC
Created attachment 146073 [details]
The slow loading in action

SUMMARY
When I super+tab, the thumbnails of different activities often take longer to load than it takes me to switch to another activity.
Most likely happens because I'm using very high res wallpapers. All of them are bigger than 5120x2880 and vary in file size from 2.4 MiB to 16.8 MiB.
If it is impossible to load the wallpapers quickly enough, there should be a way to cache down-scaled versions of them for such time sensitive uses.

STEPS TO REPRODUCE
1. Super + Tab

OBSERVED RESULT
Grey rectangles that become colored rectangles after a good delay

EXPECTED RESULT
Colored rectangles

SOFTWARE/OS VERSIONS
Operating System: Garuda Linux
KDE Plasma Version: 5.23.5
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2
Kernel Version: 5.16.3-zen1-1-zen (64-bit)
Graphics Platform: X11
Processors: 8 × AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx
Memory: 5.7 GiB of RAM
Graphics Processor: AMD Radeon Vega 8 Graphics