[Libreoffice-bugs] [Bug 129050] New: Table rendering is extremely, unacceptably slow (Writer)

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=129050

            Bug ID: 129050
           Summary: Table rendering is extremely, unacceptably slow
                    (Writer)
           Product: LibreOffice
           Version: 6.2.8.2 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: jamshark70 at zoho.com

Created attachment 156135
  --> https://bugs.documentfoundation.org/attachment.cgi?id=156135&action=edit
One page, two tables, very very slow rendering

The performance of table rendering is so bad -- appalling -- that Writer is
very nearly unusable when tables are involved. Calc is somewhat faster but can
still be slow.

I will attach a typical form from my school. On my system, it takes at least
5-15 seconds for anything to display. It's a *one-page document*. 5 seconds to
render one page on a modern computer system is ludicrous.

Scrolling through the document also shows severe performance degradation -- not
quite as bad, but from a workflow perspective, it means: if you used the scroll
wheel, you will probably overshoot and have to go back (more delays), or you
had better use pageup/pagedown *one key press at a time*, waiting 1-2 seconds
every time.

Also, I believe there are spurious rendering requests being issued. To close
the document requires 5-10 seconds before it disappears. What is it doing in
that time? There is no need to process anything for display, for something that
is very shortly not going to be displayed! Same for "Save as" -- delays both
before and after saving...??? Why?

I have tried toggling OpenCL/hardware acceleration options. Nothing helps.

High CPU usage during all of these delays.

As a further test, today I upgraded from 6.1.something to 6.2.8 and my general
impression is that somehow 6.2.x has degraded the performance *even further*.
(5+ sec for 6.1.x, 10-12+ sec for 6.2.x.)

Multiple users have complained about this over many years (e.g. may be similar
to #125171, #120360 for Draw), but it has never improved.

Ubuntu 18.04.

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