Bug 508839 - High CPU usage due to aggressive thumbnail generation, until the video download is completed [from telegram]
Summary: High CPU usage due to aggressive thumbnail generation, until the video downlo...
Status: RESOLVED WORKSFORME
Alias: None
Product: dolphin
Classification: Applications
Component: general (other bugs)
Version First Reported In: unspecified
Platform: Manjaro Linux
: NOR normal
Target Milestone: ---
Assignee: Dolphin Bug Assignee
URL:
Keywords: efficiency-and-performance
Depends on:
Blocks:
 
Reported: 2025-08-28 06:51 UTC by athulkrishnasv2015
Modified: 2025-09-28 03:46 UTC (History)
2 users (show)

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

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This is a htop screenshot which shows the high CPU usage (330.29 KB, image/png)
2025-08-28 06:51 UTC, athulkrishnasv2015 		Details
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Description athulkrishnasv2015 2025-08-28 06:51:42 UTC 
Created attachment 184518 [details]
This is a htop screenshot which shows the high CPU usage

When downloading videos from telegram, Dolphin aggressively try to make thumbnails continuously till the download is completed. Which cause high CPU usage per entirety of the video is downloaded.

/usr/lib/kf6/kioworker /usr/lib/qt6/plugins/kf6/kio/thumbnail.so is using CPU but it only happens if dolphin is opened
Comment 1 Akseli Lahtinen 2025-08-28 13:08:34 UTC 
I was unable to reproduce this with downloading a .mov file with Firefox and having Dolphin open.

Does this only happen with telegram or can you reproduce it with Firefox or any other browser?
Comment 2 athulkrishnasv2015 2025-08-29 12:56:29 UTC 
(In reply to Akseli Lahtinen from comment #1)
> I was unable to reproduce this with downloading a .mov file with Firefox and
> having Dolphin open.
> 
> Does this only happen with telegram or can you reproduce it with Firefox or
> any other browser?

.mov and .mp4 do not have this issue,
It happens when downloading .mkv files
Firefox or any other browser do not have this issue ( I think because it uses filename.mkv.part for partially downloading files)
Comment 3 Bug Janitor Service 2025-09-13 03:48:24 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 4 Bug Janitor Service 2025-09-28 03:46:19 UTC 
🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.