[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 #51 from Ildar Nurislamov <absorbb at gmail.com> ---
Same story - with diablo it is hardly possible to achieve delay.
I came out with different theory. what if Diablo actually makes everything
slower (as it should). And Konsole manages to draw much less fps so frame
buffers or queues (i don't know) doesn't overrun. Yes i have no idea how driver
works. But behavior with TearFree disabled make me believe that there must be
some queue somewhere and that this queue can be insanely long like few seconds
of drawing at ~20fps (what i think is weird. before i though that there is
tripple buffer and nothing more)
Or maybe this is not frames queue in the driver but rather X protocol commands
queue in the X server. And QT is the one who stupidly overwhelm server with
commands without much care of produced result. QT doesn't use xrender backend
by default. It may be abandoned and broken.

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