Bug#1105856: freecad: FreeCAD much slower on Debian native than Flatpak version

[Jelle Haandrikman]

Hi,

I've done some further investigation.

It seems there are 2 problems.

1) The update of the sketcher dimensions is slow. This also occurs when 
using the FreeCAD Appimg files. But not with the Flatpaks from FreeCAD. 
Both the stable as the beta edition.

2) I see some repetive residual ghosting after exiting the sketcher, and 
doing some panning and zooming. This only occurs when the part is semi 
transparent. This seems like a Wayland problem. Because if I execute 
FreeCAD with: "QT_QPA_PLATFORM=xcb freecad", the ghosting disappears.

I will try some more testing to see where the first problem comes from. 
I have not much understanding of the Wayland problem, but a workaround 
does exist.

best regards,
Jelle

On 2025-05-16 11:06, Jelle Haandrikman wrote:
> Package: freecad
> Version: 1.0.0+dfsg-6
> Severity: normal
> X-Debbugs-Cc:jhaand at freedom.nl
>
> Dear Maintainer,
>
> Currently I'm modelling a fairly complex model in FreeCAD. I see significant
> slowdown with the Debian package versus the Flatpak edition.
>
> Observed:
> Editing this file with the Debian native package. The Debian version is around
> 5 times slower when navigating and updating a moved dimension in a sketch takes
> around a second.
>
> Expected:
> Both editions of FreeCAD having the same speed.
>
> Further information:
>
> The FreeCAD model:
> https://grabcad.com/library/tanmatsu-spacer-1
>
> Discussion on FreeCAD forum:
> https://forum.freecad.org/viewtopic.php?style=3&t=97090
>
>
> -- System Information:
> Debian Release: trixie/sid
>    APT prefers testing
>    APT policy: (500, 'testing')
> Architecture: amd64 (x86_64)
> Foreign Architectures: i386
>
> Kernel: Linux 6.12.27-amd64 (SMP w/8 CPU threads; PREEMPT)
> Locale: LANG=en_NL.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8), LANGUAGE=en_US.UTF-8
> Shell: /bin/sh linked to /usr/bin/dash
> Init: systemd (via /run/systemd/system)
> LSM: AppArmor: enabled
>
> Versions of packages freecad depends on:
> ii  freecad-python3  1.0.0+dfsg-6
> ii  python3          3.13.3-1
>
> Versions of packages freecad recommends:
> pn  calculix-ccx        <none>
> ii  graphviz            2.42.4-3
> ii  python3-opencamlib  2023.01.11-5+b3
>
> Versions of packages freecad suggests:
> ii  povray  1:3.7.0.10-3+b2
>
> -- no debconf information

-- 
---------------------------------------------------------------------------
              Jelle Haandrikman          System Tester
        mail:jhaand at freedom.nl          Mastodon: @jhaand at mas.to
                         website:http://jhaand.nl
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