[Libreoffice-bugs] [Bug 141286] New: Documents in Open Document format cause delay / lag when switching slides in "Normal" and Presentation Mode

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=141286

            Bug ID: 141286
           Summary: Documents in Open Document format cause delay / lag
                    when switching slides in "Normal" and Presentation
                    Mode
           Product: LibreOffice
           Version: 7.1.1.2 release
          Hardware: All
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Impress
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: schnitzelbub at posteo.de

Description:
I experience laggy performance in most recent Impress as observed here:
https://ask.libreoffice.org/en/question/261988/libreoffice-calc-70-very-slow/

I can confirm that the delay is related to Open Document formats only.

The application seems to be a bit more responsive when changing through slides
in the "Notes" view, but lacks massively in "Normal" and Presentation Mode
(F5).
Files are local (SSD), no network involved running LibreOffice.

Regards,
sbub

Steps to Reproduce:
1. Create a new Impress presentation
2. Add simple slides (no real content required)
3. Store as *.odp
4. Navigate through slides (e.g. via Page-Keys)

Actual Results:
delay/lag between slide changes around 2-3 seconds

Expected Results:
no delay between slide changes


Reproducible: Always


User Profile Reset: Yes



Additional Info:
Seems to be related to Open Document Format only as: saving the same
presentation as *.pptx and then navigating through slides imposes no noticeable
delay/lag.

Version: 7.1.1.2 / LibreOffice Community
Build ID: 10(Build:2)
CPU threads: 4; OS: Linux 5.10; UI render: default; VCL: gtk3
Locale: de-DE (de_DE.UTF8); UI: de-DE
7.1.1-1
Calc: threaded

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