[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 #35 from Ildar Nurislamov <absorbb at gmail.com> ---
It is sad. But nothing changed for me.
I've made some additional tests with different modes. Maybe this can shed some
light:
1. TearFree true, kwin Xrender - lag that grows in time. it takes seconds to
draw 1 frame after some time of intense scrolling
2. TearFree false, kwin Xrender - smooth. kinda. there is a delay in drawing
actual screen content that grows in time. so after i stop doing anything my
screens keeps draw all the frames until it catches up.
3. TearFree false, kwin OpenGL 3.1, Vsync Full screen repaint - same as 1 but
lag between redraws grows with slower speed.
4. TearFree false, kwin OpenGL 3.1, Vsync None - same as 1 but lag between
redraws grows with slower speed.

Something wrong with the way kde applications draws themselves. Even kwin can't
handle it. Or maybe this is kwin's bug. Im going to test with different WM...

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