[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 #6 from Ildar Nurislamov <absorbb at gmail.com> ---
Created attachment 97394
  --> https://bugs.freedesktop.org/attachment.cgi?id=97394&action=edit
High iowait

So i grab scroll bar and start to move it like ∞ (to exclude disk io from
reading scrollback buffer) very fast. after some time it gets very laggy till
display stops to redraw completely (even mouse cursor hangs) after that i can
witness spike of iowait for 1 core for a moment. sometimes to 100%. 

it depends on window size. If Konsole size is small e.g. 869,653 - everything
is fast - and i cannot reproduce problem no matter how hard i try.

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