https://bugs.kde.org/show_bug.cgi?id=460126
Bug ID: 460126
Summary: Previews are not cached (remote fs)
Classification: Applications
Product: dolphin
Version: 22.08.1
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: dolphin-bugs-n...@kde.org
Reporter: bankma...@protonmail.com
CC: kfm-de...@kde.org
Target Milestone: ---
SUMMARY
When browsing a remote fs, Dolphin is extremely wasteful about thumbnail
generation.
Dolphin does not seem to cache any previews and re-generates previews for a
file on every encounter. This is bad for the following reasons:
- wear and tear on hard disks
- network usage
- slows down browsing, even a moderate amount of files, nothing out of the
ordinary, can grind Dolphin to halt; one has to wait seconds on every
navigation before being able to perform the next navigation
STEPS TO REPRODUCE
1. Ensure you have a remote fs
2. Open iftop
3. Open Dolphin
4. Ensure Dolphin detects your fs as a remote fs (check whether it's listed
under "Remote" in the sidebar)
5. Navigate to any directory that contains files which Dolphin generates
previews for, observe traffic spike in iftop session, observe thumbnail
generation
6. Navigate to a different directory
7. Navigate to the initial directory and observe traffic spike in iftop
session, observe thumbnail regeneration
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux (x86_64)/5.25.5
KDE Plasma Version: 5.25.5-1
KDE Frameworks Version: 5.98.0-1
Qt Version: 5.15.6+kde+r177-1
ADDITIONAL INFORMATION
The remote fs that I used for testing is a SMB share mounted via CIFS. Dolphin
correctly detects it as a remote fs, it is listed under "Remote".
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