https://bugs.kde.org/show_bug.cgi?id=422306

--- Comment #34 from David Faure <fa...@kde.org> ---
Keep in mind that if most of the time is spent waiting (for I/O, network,
mutex....) then using hotspot to look at CPU cycles will tell you nothing. You
want to check the "off-CPU profiling" checkbox in hotspot, and look at wait
times (in the flamegraph, look at the combobox which says "cycles", change it
to "off-CPU Time").
If you get errors about sched_wait or something, run this script:
http://www.davidfaure.fr/kde/perf-init

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