https://bugs.kde.org/show_bug.cgi?id=523433
Bug ID: 523433
Summary: Significant slowdowns due to high CPU and GPU load
Classification: Applications
Product: konsole
Version First 26.04.0
Reported In:
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 194567
--> https://bugs.kde.org/attachment.cgi?id=194567&action=edit
high load during typing
DESCRIPTION
Hi, I'm experiencing significant slowdowns and input lag when typing text in my
terminal (Konsole or Yakuake). During these periods, Xorg uses 70% of the CPU,
Konsole or Yakuake uses up to 50%, and the GPU is at 50%.
See, perf profiling and video attachments.
STEPS TO REPRODUCE
1. Type some text in Konsole
OBSERVED RESULT
- This doesn't happen when I'm typing text in KWrite or Kate.
- gnome-terminal: No issues. CPU usage is under 1% for the same task, and GPU
usage is at 3%.
- “QT_WIDGETS_RHI=1” drops Xorg usage to 0%.
Normal configuration:
Xorg ≈ 65%
Konsole ≈ 45%
GPU ≈ 50%
With QT_WIDGETS_RHI=1:
Xorg ≈ 0%
Konsole ≈ 80%
GPU ≈ unchanged
- Performance is proportional to the window’s area (or at least proportional to
its width).
- Changing the font or profile makes no difference.
- Enabling or disabling compositing does not solve the problem.
EXPECTED RESULT
---
SOFTWARE/OS VERSIONS
Tested on 2 installations:
- Recent Debian Testing on Virtualbox (wayland),
- Main installation on Kali (Debian Testing frozen on June 2026) (X11).
Operating System: Debian GNU/Linux forky/sid
KDE Plasma Version: 6.6.5
KDE Frameworks Version: 6.26.0
Qt Version: 6.10.2
Kernel Version: 7.1.3+deb14-amd64 (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i7-3630QM CPU @ 2.40GHz
Graphics Processor: NVIDIA GeForce GTX 670MX
Operating System: Kali GNU/Linux 2026.2
KDE Plasma Version: 6.6.5
KDE Frameworks Version: 6.23.0
Qt Version: 6.10.2
Kernel Version: 6.19.14+kali-amd64 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-3630QM CPU @ 2.40GHz
Graphics Processor: NVIDIA GeForce GTX 670MX
ADDITIONAL INFORMATION
Attached:
- Application profiling with perf and hotspot (the ‘--sample-cpu’ parameter was
added) on Debian Testing
- Video recording, input generated using xdotool, monitoring of Xorg, Konsole,
and GPU usage
--
You are receiving this mail because:
You are watching all bug changes.
