[Libreoffice-bugs] [Bug 121985] New: Editing any slide element (text, shapes, images, etc.) causes noticeable lags

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=121985

            Bug ID: 121985
           Summary: Editing any slide element (text, shapes, images, etc.)
                    causes noticeable lags
           Product: LibreOffice
           Version: 6.1.3.2 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Impress
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: s.zb at posteo.at

Description:
First of all, THANK YOU developers for your hard work! I LOVE LibreOffice, it's
a great peace of software with a good cause and I don't want to aggravate
anyone by reporting this. However, at this point, I feel I have to.

Here's the deal: Creating and editing slides in Impress (basically: just using
it) starts out with slight UI lags/freezes. This isn't too bad, but adding more
slides and/or more slide elements makes matters worse quickly. The lags/freezes
reach a point where it takes me several seconds to being able a simple text box
after I click it. And even then selecting, removing or adding text may take as
much between one and several seconds.

The same goes for other procedures, such as moving elements (e.g. a picture)
around on a slide - it's really choppy and gets worse with time (as the
presentation 'grows' and contains more slides and/or elements). 

I don't know how to be more specific, basically anything I do with slides in
Impress' is laggy for me. It has now reached a level where I basically have to
turn to other programs to create the simplest presentations. Writer or Calc, to
some extent, suffer the same problems, but not nearly as bad as Impress.

Enabling/disabling OpenGL/OpenCL; resetting my user profile; reinstalling the
LO or the entire OS seems to have little to no effect.

Bug reports I've found and *think* that they are somehow related to this (since
they describe one or more aspects of what I'm experiencing):
104295/105500/112610/116975/120461

The version I'm reporting this for comes from the official 'Fresh' PPA
(ppa:libreoffice/libreoffice-6-1). The problem, however, persists for me since
version 5.x.x.x and seems to have worsened over time. So the behavior described
above is reproducable for me over multiple versions of LO, over a period of
time, on different PCs and notebooks, on different operating systems (mostly
Ubuntu-based, however), with installations from the official repositories or
from the LibreOffice PPA.

Steps to Reproduce:
1. Create some simple text-based or 'heavy' image-/graphic-based slides with
Impress (makes no difference for me, but 'heavy' presentations will show the
fault sooner).

2. Try editing some text, move shapes/images around, add more slides to the
presentation.

3. At some point (I can't really pinpoint it) actions like selecting a
textbox/an image/etc., moving it, editing it and so on become less and less
responsive. 

Actual Results:
Changes are not displayed smoothly but are choppy/laggy to the point of being
displayed with a delay of several seconds.

Expected Results:
Selecting/Editing/Moving items should happen rather instantaneously and
smoothly.


Reproducible: Always


User Profile Reset: Yes



Additional Info:
Version: 6.1.3.2
Build-ID: 1:6.1.3~rc2-0ubuntu0.18.04.2
CPU-Threads: 4; BS: Linux 4.15; UI-Render: Standard; VCL: gtk3_kde5; 
Gebietsschema: de-AT (en_GB.UTF-8); Calc: group threaded
------------------- 
Operating System: KDE neon 5.14
Processors: 4× AMD A8-5545M APU with Radeon HD Graphics
Memory: 7.0 GiB of RAM

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