https://bugs.kde.org/show_bug.cgi?id=455585

--- Comment #49 from Blazer Silving <breakingsp...@gmail.com> ---
With Plasma 6.1.4, the Windowheap slowness/stuttering has improved markedly in
X11 (likely due to the new triple buffering) and the effects seem to sync with
the monitor as close as it can. 

I still encounter slowdowns in roughly 1 in 10 interactions with the
Overview+Grid though. I open the effect every 5 minutes during work so I notice
anything odd with it, and this stands out. The GPU load doesn't spike during
these slowdowns but CPU load for kwin_x11 does. I notice other users in this
thread reporting CPU spikes, perhaps a single routine or condition in the Kwin
process isn't being offloaded to GPU properly? 

The "Show FPS" Kwin counter stays at 144hz so I don't believe it's accurate to
this issue, it may just be reporting the monitor rate? To note, I have AMD
"Tearfree" enabled in X11 config, but toggling it off doesn't seem to make a
difference.

The slowdowns occur with both the new "Smart" window layout, as well as the
older Natural layout, so the positioning algorithm likely isn't the cause, the
window positions are already chosen when the slowdown hits. I'm close to having
a nested kwin debugging environment set up, so I'm hoping I can read and catch
what exactly causes the slowdown.

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