[Libreoffice-bugs] [Bug 116281] New: Slow scrolling with keyboard arrow keys in Writer ( especially with images)

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=116281

            Bug ID: 116281
           Summary: Slow scrolling with keyboard arrow keys in Writer
                    (especially with images)
           Product: LibreOffice
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: nekohayo at gmail.com

Particularly with long text documents containing images, scrolling performance
is much slower when using the keyboard's directional arrow keys (not
PageUp/PageDown) than when using the mouse wheel. One side-effect is that if
you press and hold for more than a few seconds, when you release the key
LibreOffice Writer will keep scrolling for a while until it stopped processing
the queue of keypress events.

I posit that the reason why the mousewheel is more performant is that its
scroll events are discrete (I don't have one of those analog super-smooth
scroll wheels or touchpads, mine just goes "click click click" while you rotate
the wheel), whereas pressing and holding the keyboard's arrow keys generates
dozens of events per second, flooding LibreOffice with those. The result is
that scrolling "feels" slower than it could be if those events were
"compressed" to a lower rate.

Of course, in an ideal world any kind of scrolling (including "smooth"
scrolling) should be performant and responsive. I'm just saying that I see
better scrolling performance with "clicky" mousewheels than the keyboard, and
that there could be a possibility of optimizing the keyboard (i.e.: "don't do
too much/needless work") to match that kind of performance.

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