https://bugs.kde.org/show_bug.cgi?id=371889

--- Comment #18 from Enrico Tagliavini <enrico.tagliav...@gmail.com> ---
Created attachment 102168
  --> https://bugs.kde.org/attachment.cgi?id=102168&action=edit
callgrind record of plasma shell (slow performance)

I've run a profiling run with callgrind. I started it with

valgrind --tool=callgrind --instr-atstart=no
--callgrind-out-file=plasmashell-callgrind.out -- plasmashell --shut-up

so the instrumentation was not on during the whole startup. I waited a couple
of hours with two panels and something animating in the systray. Once the CPU
usage was maximized I started the instrumentation and also started switching
active window as fast I could by using the mouse between two. Then I stopped
instrumentation and stopped valgrind.

Oddly enough, while plasma uses a lot of CPU and is quite slower compared to a
fresh start, the system performance was not dragged down as much. Usually the
whole system feels slower when plasma starts using more resources, for example
kwin animations are much slower. Firefox feels slower. Probably everything
related to rendering feels slower. Likely valgrind just shuffling the
conditions, but I thought I should mention it.

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