[Libreoffice-bugs] [Bug 129900] New: Exiting Writer's Print Preview mode is slow in long documents

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=129900

            Bug ID: 129900
           Summary: Exiting Writer's Print Preview mode is slow in long
                    documents
           Product: LibreOffice
           Version: 6.3.4.2 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: max at maxbarry.com

Compared to LibreOffice 5, exiting Print Preview in long documents is extremely
slow.

With a 1,500 page document, for example, exiting Print Preview is instant in
LO5, but takes 5-6 seconds (!) in LO6.

To reproduce:

1. In LibreOffice 6 Writer, fill a document with text so that it comprises at
least a few hundred pages.

2. Enter Print Preview (e.g. File -> Print Preview).

3. Observe it takes a second or two (based on document length) to display the
Print Preview screen. This is similar to LibreOffice 5.

4. Press Escape to exit Print Preview mode.

5. Observe a significant delay (approx. 5-6 seconds for a 1,500 page document)
with CPU usage spiking before returning to normal view. There is no such delay
in LibreOffice 5.3.0.3 Writer.

I tend to flip back and forth between Normal View and Print Preview when
editing a document, and this new delay makes this very awkward.

Ubuntu 19.10

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