[Libreoffice-bugs] [Bug 120014] MacOS: Lots of unresponsiveness (beachballs) when enabling automatic spell checking in a large document

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=120014

--- Comment #4 from Alex Thurgood <iplaw67 at tuta.io> ---
I had a look at this with Instruments.app, the Apple provided developer tool
and carried out a time profile using an older version of the Writer Guide ODT
as a test document in a non-debug, production release version of LO 6152.

A fairly significant amount of time, when scrolling either with the vertical
document scrollbar or the mouse wheel scroll function, comes from :

+0x160  callq               "PaintHelper::DoPaint(vcl::Region const*)"

which is called several hundred times in certain cases, leading to a time
occupation of several hundred milliseconds.

That call is linked to :


vcl::Window::ImplCallPaint(vcl::Region const*, ImplPaintFlags)

which calls

SwDashedLine::Paint(OutputDevice&, tools::Rectangle const&)

I am enclosing a screenshot of the Instruments.app output zoomed in on an area
of the trace where the processing time caused a noticeable slowdown/lag in
cursor scrolling.

Analysing the functions called in this area of the trace points to the calls I
indicated above.

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