[Libreoffice-bugs] [Bug 134263] Scrolling down in multipage view (8 pages a row) stutters/choppy (part 2)

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=134263

Telesto <telesto at surfxs.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 OS|All                         |Windows (All)

--- Comment #7 from Telesto <telesto at surfxs.nl> ---
(In reply to Buovjaga from comment #4)
> A bit choppy, but nothing super alarming

I checked it against Linux
- GTK3 -> No complains 
- GEN -> scrollbar clicking really responsive.. scrolling not slow
- QT5 -> Doesn't go well on my Lubuntu -> doesn't move at all (and complaining
about RGB64 blend not being supported)

Windows
Scrolling (scroll wheel) -> Slow (more or to compare with GEN)
Scrollbar clicking -> Not responsive

So could you please recheck with Windows.. it's quite bad ;-). This should be
noticeable with your powerful machine... However benchmarking it against Xisco
machine is of course preferred.. 

And somehow the thumbnail size matters too (5 pages 45% being really slow)
while 5 pages at 40% pretty OK. (Note: 23 inch screen; not high DPI). Not sure
what the effect of a high DPI screen would be.

50% of the CPU time is spend in ExtTextOutW GDI32
5% in GdiplusNotificationUnhook 
5% in GdipCloneBitmapAreaI      gdiplus

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