Bug 515164 - Regression: Drag-and-drop performance issue when moving a large number of images
Summary: Regression: Drag-and-drop performance issue when moving a large number of images
Status: REPORTED
Alias: None
Product: dolphin
Classification: Applications
Component: general (other bugs)
Version First Reported In: 25.12.1
Platform: Fedora RPMs Linux
: NOR major
Target Milestone: ---
Assignee: Dolphin Bug Assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2026-01-27 18:50 UTC by fabrice salvaire
Modified: 2026-01-27 18:50 UTC (History)
1 user (show)

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

Attachments
Add an attachment

Note You need to log in before you can comment on or make changes to this bug.
Description fabrice salvaire 2026-01-27 18:50:58 UTC 
SUMMARY
This is a regression issue !
Dolphin freezes when we drag-and-drop a large number of images.

STEPS TO REPRODUCE
1. Split the view
2. Select a large number of images, e.g.100 in the first view
3.  Drag-and-drop to a folder in the second view

OBSERVED RESULT
Dolphin uses a lot of CPU and freezes.
It is related to the number of selected images, more it is large more it freezes.
Beyond a certain number of images, it is no longer possible to achieve a drag-and-drop.
A workaround is too select a smaller number of files and repeat...

EXPECTED RESULT
I suspect the fancy thumbnails features to be badly implemented and only tested for a few files.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 42
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.9.3

ADDITIONAL INFORMATION