Bug 513889

Summary: Gwenview's UI becomes unusable slow, while it loads large previews in the thumbnail bar
Product: [Applications] gwenview Reporter: postix <postix>
Component: generalAssignee: Gwenview Bugs <gwenview-bugs-null>
Status: REPORTED ---    
Severity: normal Keywords: efficiency-and-performance
Priority: NOR    
Version First Reported In: 25.12.0   
Target Milestone: ---   
Platform: Other   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description postix 2025-12-27 19:56:44 UTC 
STEPS TO REPRODUCE
1. Have a folder with 24 Mega pixels images from your camera on a SSD
2. Open a JPG from the folder in Gwenview

OBSERVED RESULT
Gwenview opens and shows the JPG immediately, but slows down extremely as it keeps loading more previews for the thumbail bar for > 10 seconds.

EXPECTED RESULT
Gwenview keeps being usable.
ADDITIONAL INFORMATION
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 43
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.21.0
Qt Version: 6.10.1
Kernel Version: 6.17.12-300.fc43.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 PRO 5850U with Radeon Graphics
Memory: 16 GiB of RAM (14.4 GiB usable)