[Bug 77436] KDE Konsole very slow scrolling with TearFree and QT graphics system native

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77436

--- Comment #36 from Ildar Nurislamov <absorbb at gmail.com> ---
the same with Icewm.
i dont know if this problem deserve so much attention. QT doesn't use xrender
by default anyway. Of course it is surprising how application produces frames
without caring about whether they was drawn on screen and no proper frame
skipping takes place. I believe that app always must try to show its actual
state. The most surprising thing for me is - where all this queue of frames to
be drawn is stored. 
in 2. TearFree false, kwin Xrender mode it takes seconds or even dozens of
second to catch up to actual state. And all the frames are drawn. Where was
they stored .. so much data.

Offtopic: i've noticed sna performance regression with 3.14 kernel. from 1.18s
in gtkperf to 1.88s. should i report bug or this is smth in OpenSuSE?

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