Poor performance with KDE 6 (Wayland) on AMD laptop

After a bit of excitement for the new release, I enabled the arch testing repositories and upgraded to KDE 6. To my great dismay, however, I found the performance to be incredibly slow, which was strange considering that KDE 5 ran perfectly fine.

Using the “Show FPS” desktop effect, which I understand isn’t a benchmark but does give an idea of how good the performance of the renderer is, I found that it was locked to 30 FPS on wayland, with performance on X11 being slightly higher (35-40 FPS) but still undesirable.

This is a completely new install of Arch Linux, so I don’t think there is anything running that could bottleneck my system.

My system stats from kinfo are as such:

Operating System: Arch Linux
KDE Plasma Version: 6.0.0
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.7.7-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 PRO 5675U with Radeon Graphics
Memory: 14.4 GiB of RAM
Graphics Processor: AMD Radeon Graphics

I’m wondering if this is something I did poorly on my end or a bug with KDE 6 on certain AMD gpus.

476860. It is marked as resolved but it is not. I have been continuing discussion on 477959 thread, but the issue is gone stale.

Thank you for linking those bug reports! Setting KWIN_DRM_NO_AMS=1 mostly fixed my performance, albeit it’s not at a perfect 60. I’ll continue to follow those two reports to see when the issue is finally fixed.

The bug, at least on my side, was fixed by this merge. On Arch, it’s been included in the latest version of plasma at time of writing.

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Fixed on my Intel too!!