https://bugs.kde.org/show_bug.cgi?id=474644
Bug ID: 474644
Summary: Dolphin's hold-click-drag to select performance is
very poor
Classification: Applications
Product: dolphin
Version: unspecified
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: view-engine: general
Assignee: dolphin-bugs-n...@kde.org
Reporter: mira...@mirandastreeter.com
CC: kfm-de...@kde.org
Target Milestone: ---
SUMMARY
Dolphin uses an extraordinary amount of CPU for the selection rectangle. This
dramatically worsens as resolution increases. As a result, it feels quite
choppy. It's especially noticeable on high refresh monitors. I'm guessing
something accidentally hit O(n^2) instead of O(n).
STEPS TO REPRODUCE
1. Open Dolphin, maximized. On a high res screen if possible, or alternatively
at low display scale factors
2. Watch CPU usage for Dolphin, in my case I just ran htop --pid=$(pgrep
dolphin) --delay=1
3. Click and drag anywhere in the window (and not by scrolling, but by moving
the mouse cursor)
OBSERVED RESULT
Dolphin's CPU usage spikes to the point it maxes out a core and the effect
feels really choppy
EXPECTED RESULT
Select dragging is performant, not choppy, and doesn't max out a core
SOFTWARE/OS VERSIONS
Linux Version: 6.5.3-arch1-1
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.10
KWin Backend: Wayland
Mesa 23.1.7 (AMD RX 6600 XT)
ADDITIONAL INFORMATION
Note this is NOT to do with selecting files/folders and moving them. This is
only as you CREATE the selection box.
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