Bug 401469

Summary:	High CPU usage when grabbing and moving images around the screen.
Product:	[Applications] gwenview	Reporter:	Chrisitan Engholm <cavaleiro.de.lodoss>
Component:	general	Assignee:	Gwenview Bugs <gwenview-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	bugseforuns, cavaleiro.de.lodoss, idontfeelcomfygivingyoumyemail, postix
Priority:	NOR
Version First Reported In:	17.12.3
Target Milestone:	---
Platform:	openSUSE
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	A screenshot of the problem, but I recommend watching the video I linked.

Description Chrisitan Engholm 2018-11-27 14:41:47 UTC

Created attachment 116535 [details]
A screenshot of the problem, but I recommend watching the video I linked.

SUMMARY
When I open an image and grab it to move, CPU usage spikes and Gwenview becomes very slow until it finishes moving. Scrolling doesn't cause any problem. 

STEPS TO REPRODUCE
1. Open an image large enough;
2. Open Ksysguard to monitor cpu usage;
3. Grab the image and try to move it, like if you were trying to see the rest of it, zoom in if necessary.

OBSERVED RESULT
CPU usage spikes and Gwenview gets slow until it finishes moving the image around.

EXPECTED RESULT
Normal CPU usage.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: OpenSUSE Leap 15.0 
KDE Plasma Version: 5.12.6
KDE Frameworks Version: 5.45.0
Qt Version: 5.9.4

ADDITIONAL INFORMATION
Video here: https://www.youtube.com/watch?v=KESacDWYqKo&feature=youtu.be
Hardware:
Intel Core i7-4790 3.60GHz
16 Gb RAM
NVIDIA GEFORCE GTX980 TI (driver 390.87)
I am just using the standard repositories that came with openSUSE Leap 15 plus the community and NVIDIA ones that Yast lists by default.
Desktop effects are turned on and I didn't change anything related to them.

Comment 1 Patrick Silva 2019-02-21 15:47:35 UTC

I can confim on my system.

Operating System: Arch Linux 
KDE Plasma Version: 5.15.1
KDE Frameworks Version: 5.55.0
Qt Version: 5.12.1
Kernel Version: 4.20.10-arch1-1-ARCH
OS Type: 64-bit
Processors: 2 × Intel® Celeron® CPU G1820 @ 2.70GHz
Memory: 7,7 GiB of RAM

Comment 2 Patrick Silva 2019-02-21 15:48:12 UTC

I use gwenview 18.12.2.

Comment 3 A Linux User 2025-08-19 19:17:44 UTC

Cannot reproduce. Is it still an issue?

Comment 4 Bug Janitor Service 2025-09-03 03:47:51 UTC

🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!

Comment 5 Bug Janitor Service 2025-09-18 03:48:22 UTC

🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.