https://bugs.documentfoundation.org/show_bug.cgi?id=158936

            Bug ID: 158936
           Summary: Writer extremely sluggish on larger files converted
                    from .pdf. Appears to max out single cpu core
           Product: LibreOffice
           Version: 7.6.4.1 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs@lists.freedesktop.org
          Reporter: pbpub...@vivaldi.net

Description:
I have had this problem for many years. I thought my new Ryzen system would
solve it, but it hasn't. 

I often work on files converted from .pdf, often fairly large, Opening them in
LO takes up to 10 minutes at times, or fails altogether. If I can get it open
the solution then usually is to remove all ad hoc formatting and convert
various paragraph and page styles to a simple few. 

Today I tried working with a 16MB .pdf. I tried converting it to .docx via
ilovepdf.com and then adobe.com, but LO, FreeOffice, and even Google Docs would
not open the .docx.

Then I opened the .pdf in Okular (no problem doing so) and did a text export.
This opens fine in geany, but not in LO. So I truncated it to the manageable
first 500kb to work on it. I stripped all formatting and converted everything
to Default Paragraph Style and saved as .odt, at 520KB. Usually that's enough
to solve performance problems, but this one is still a bear to work on.

What happens is the cpu will go to 9-11% and hang there. That's doesn't sound
bad, but what I think is happening is Writer is only working with one core, and
that core is maxed out. The behavior is the same as if the cpu is maxed. LO
freezes, usually alone, but sometimes Dolphin file manager will freeze too.

Calc has a setting to enable multicore processing, but it does not help this
Writer problem

I'm on 7.6.4.1 on Linux. I also used to have this problem in my Windows days
years ago.


Steps to Reproduce:
1.Open large file with a lot of ad hoc formatting
2.
3.

Actual Results:
File may or may not open. If it does open, Writer will freeze up doing simple
things like scrolling down.

Expected Results:
File should open and be workable.


Reproducible: Always


User Profile Reset: No

Additional Info:
...

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