https://bugs.kde.org/show_bug.cgi?id=516721
Bug ID: 516721
Summary: Performance regeression in Kwin when using Flatpak
Classification: Plasma
Product: kwin
Version First 6.6.0
Reported In:
Platform: Neon
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
With Kwin 6.6, if any Flatpak app does any I/O (display, network, reading
files, etc.) it seems there are quite a few interrupts or short locks in the
main loop of Kwin (only speculating; this is my best guess as to what is
happening).
This can cause delays in everything in the system, which can be observed in:
- laggy keyboard input or graphics (typing inside Firefox is often a test of
patience now, sometimes System Settings lags so I get to see the different
controls on a page before the layout is applied, moving windows around is
laggy)
- stuttering in video playback
- slow launching of applications (Application Menu, System Settings, and
Discover have all been observed to be badly affected)
- Plasma itself (desktop, panels, popup windows, etc.) or any application can
appear unresponsive or frozen, sometimes for up to several seconds
- high CPU utilization
- other random bugs (at one point the LSP Client in Kate only started in some
of the instances I opened!)
The effects are not constant and seem to vary, though it does appear that
simply having a Flatpak based application running by itself doesn’t seem to be
a problem, as long as it does no IO.
I'm running this on a Slimbook laptop with an external display:
Operating System: KDE neon User Edition
KDE Plasma Version: 6.6.0
KDE Frameworks Version: 6.23.0
Qt Version: 6.10.2
Kernel Version: 6.17.0-14-generic (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5700U with Radeon Graphics
Memory: 64 GiB of RAM (62.2 GiB usable)
Graphics Processor: AMD Radeon Graphics
Manufacturer: SLIMBOOK
Product Name: PROX-AMD5
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