https://bugs.kde.org/show_bug.cgi?id=417592

--- Comment #11 from bug2...@wolke7.net ---
I'm trying to understand what, what the plot in the showfps effect mean. 

The most left blue bar is obviously the same fps value as displayed
numerically.

The left (colorful) plot show the compositors rendering time:
<=10ms green, <=20ms yellow, <=50ms red, >50ms black

The right plot plots the log10 of the refreshed window pixel (maxes out at ~15
Mpixel)

Currently I'm running on the low latency patched kwin-5.8.2 (maybe later I can
switch back) It makes it more visible if everything is running correctly as the
green rendering plot shrinks to a thin line (2-3ms).

The main problem I see are windows generating endless amount of refresh events,
even if their content does not change. Typically this state can be cleared by
dragging the window into a tile position (left, right, top left, but not
maximized)
One way to bring an window into that state is loosing focus to an different
window that covers the affected window.

Another way is to go to suspend and resume. After dragging all the windows at
least one time into a corner clears that state and the rendering time is down
to 2-3ms again.

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